# Packaging and Filling Machine Operators and Tenders

US SOC code 51-9111. Markdown version of https://futurehistory.earth/timeline/51-9111

Also called: Packaging machine operator, Filling machine operator, Packaging operator, Production line operator, Machine tender.

## In brief

In May 2025, [BLS](https://www.bls.gov/oes/special-requests/oesm25nat.zip) counted **379,060** US packaging and filling machine operators and tenders, with median pay of **$43,220** a year. Of the BLS counts since 2003, the highest was **411,660**, in May 2004. The earliest figure here is [an estimate](https://usa.ipums.org/usa/volii/92occup.shtml) of **65,000** from 1930, not measured the same way as today's count. The last full technology era in this work: e-Commerce secondary packaging surge + collaborative robots, 2010 to 2016.

## What the sources say

### Official outlook

BLS projects employment to grow 4.1% from 2025 to 2035. Source: [BLS Employment Projections 2025-35](https://data.bls.gov/projections/nationalMatrix?queryParams=51-9111&ioType=o).

### AI exposure studies

- **7.5%** of this job's tasks are exposed to large language models. Not a forecast of job losses. [Eloundou and others, 2023](https://github.com/openai/GPTs-are-GPTs/blob/main/data/occ_level.csv)
- **0.98** estimated probability that the whole occupation could be computerised, over an unspecified number of years. Not a forecast of job losses. [Frey and Osborne, 2013](https://oms-www.files.svdcdn.com/production/downloads/academic/The_Future_of_Employment.pdf)

### Since the 2013 prediction

In 2013, Frey and Osborne put this job's probability of computerisation at 0.98. BLS counted **372,210** of these jobs in May 2013 and **379,060** in May 2025 (+2%, a change derived by Future History).

Data as of BLS OEWS May 2025; BLS Employment Projections 2025-35. BLS publishes these counts as yearly survey snapshots and cautions against reading them as a precise trend. In May 2021 BLS changed how it estimates these counts (a model-based method using three years of survey data) and moved fully to the 2018 occupation codes, so part of a change across 2021 can come from the method rather than the work.

## Packaging and Filling Machine Operators and Tenders employment and pay by year

- On record since: 1908
- Latest US employment: 379,060 (May 2025). Source: BLS OEWS May 2025 [5]
- Latest US median pay: $43,220 (May 2025). Source: BLS OEWS May 2025 [12]
- Outlook: +4.1% by 2035. Source: BLS Employment Projections 2025-35 [28]

### In other countries

The latest figure each country's statistics agency publishes for this job. Each uses its own occupation definition, survey basis and currency, so the numbers are not directly comparable with each other or with the US figures.

- **United Kingdom** (UK SOC 9132)
  - Employment, 2025: 61,000. Source: ONS ASHE 2025 [8]. ONS Annual Survey of Hours and Earnings (Table 14): employee jobs in SOC 9132 Packers, bottlers, canners and fillers, United Kingdom, 2025 (ASHE "number of jobs", thousands x1000; excludes self-employment). Open Government Licence v3.0.
  - Median pay, 2025: £25,087. Source: ONS ASHE 2025 [16]. ONS Annual Survey of Hours and Earnings (Table 14.7a): median gross annual pay for all employee jobs in SOC 9132 Packers, bottlers, canners and fillers, United Kingdom, 2025. Open Government Licence v3.0.
- **Australia** (ANZSCO 7119)
  - Employment, 2025: 12,900. Source: ABS Labour Force Survey [9]. ABS Labour Force Survey (Detailed), table EQ08: employed persons in ANZSCO 7119 Other Machine Operators, national (summed across sex and state/territory), annual average of 4 quarterly estimates.
  - Median pay, 2025: A$80,808. Source: ABS Employee Earnings May 2025 [17]. Annualised (x52) from A$1,554 median weekly earnings. ABS Survey of Employee Earnings and Hours, May 2025: median pay for full-time non-managerial employees paid at the adult rate, before tax. Surfaced via the Jobs and Skills Australia occupation profile.

### All 27 years of cited US data

| Year | US employment | Annual pay (median unless marked) | Source |
| --- | --- | --- | --- |
| 1930 | 65,000 (estimate) | n/a | Est., IPUMS USA [1] |
| 1950 | 160,000 (estimate) | $2,800 (estimate) | Est., University of Missouri Libraries [2] |
| 1980 | 370,000 (estimate) | $14,500 (estimate) | Est., BLS [3] |
| 2000 | 370,080 | n/a | BLS OEWS 2000 [4] |
| 2003 | 400,680 | $21,740 | BLS OEWS May 2003 [5] |
| 2004 | 411,660 | $22,200 | BLS OEWS May 2004 [5] |
| 2005 | 396,270 | $22,930 | BLS OEWS May 2005 [5] |
| 2006 | 384,160 | $22,990 | BLS OEWS May 2006 [5] |
| 2007 | 368,320 | $23,760 | BLS OEWS May 2007 [5] |
| 2008 | 357,480 | $24,400 | BLS OEWS May 2008 [5] |
| 2009 | 338,920 | $25,130 | BLS OEWS May 2009 [5] |
| 2010 | 342,280 | $25,270 | BLS OEWS May 2010 [5] |
| 2011 | 354,810 | $25,620 | BLS OEWS May 2011 [5] |
| 2012 | 367,700 | $25,860 | BLS OEWS May 2012 [5] |
| 2013 | 372,210 | $26,310 | BLS OEWS May 2013 [5] |
| 2014 | 381,760 | $26,410 | BLS OEWS May 2014 [5] |
| 2015 | 378,560 | $27,080 | BLS OEWS May 2015 [5] |
| 2016 | 386,520 | $28,290 | BLS OEWS May 2016 [5] |
| 2017 | 392,910 | $29,350 | BLS OEWS May 2017 [5] |
| 2018 | 395,330 | $30,160 | BLS OEWS May 2018 [5] |
| 2019 | 390,540 | $30,990 | BLS OEWS May 2019 [5] |
| 2020 | 370,910 | $32,640 | BLS OEWS May 2020 [5] |
| 2021 | 358,640 | $35,960 | BLS OEWS May 2021 [5] |
| 2022 | 369,330 | $36,750 | BLS OEWS May 2022 [5] |
| 2023 | 371,600 | $38,330 | BLS OEWS May 2023 [5] |
| 2024 | 383,860 | $40,900 | BLS OEWS May 2024 [5] |
| 2025 | 379,060 | $43,220 | BLS OEWS May 2025 [5] |

## Sources (102)

### Employment series

1. [IPUMS USA — 1930 Census occupational data, "Operatives" in food manufacturing and paper products industries](https://usa.ipums.org/usa/volii/92occup.shtml), IPUMS / University of Minnesota
2. [University of Missouri Libraries — "Prices and Wages by Decade: 1950-1959" (BLS industry wage surveys, food manufacturing operatives)](https://libraryguides.missouri.edu/pricesandwages/1950-1959), University of Missouri Libraries / BLS historical sources
3. [BLS — "Forty years of falling manufacturing employment" (BLS Beyond the Numbers, 2020); manufacturing employment peak 1979](https://www.bls.gov/opub/btn/volume-9/forty-years-of-falling-manufacturing-employment.htm), Bureau of Labor Statistics
4. [BLS OES 2000 national estimates (flat file)](https://www.bls.gov/oes/special-requests/oes00nat.zip), Bureau of Labor Statistics
5. BLS OEWS, national cross-industry estimates (flat file), Bureau of Labor Statistics. Editions: [2003](https://www.bls.gov/oes/special-requests/oesm03nat.zip), [2004](https://www.bls.gov/oes/special-requests/oesm04nat.zip), [2005](https://www.bls.gov/oes/special-requests/oesm05nat.zip), [2006](https://www.bls.gov/oes/special-requests/oesm06nat.zip), [2007](https://www.bls.gov/oes/special-requests/oesm07nat.zip), [2008](https://www.bls.gov/oes/special-requests/oesm08nat.zip), [2009](https://www.bls.gov/oes/special-requests/oesm09nat.zip), [2010](https://www.bls.gov/oes/special-requests/oesm10nat.zip), [2011](https://www.bls.gov/oes/special-requests/oesm11nat.zip), [2012](https://www.bls.gov/oes/special-requests/oesm12nat.zip), [2013](https://www.bls.gov/oes/special-requests/oesm13nat.zip), [2014](https://www.bls.gov/oes/special-requests/oesm14nat.zip), [2015](https://www.bls.gov/oes/special-requests/oesm15nat.zip), [2016](https://www.bls.gov/oes/special-requests/oesm16nat.zip), [2017](https://www.bls.gov/oes/special-requests/oesm17nat.zip), [2018](https://www.bls.gov/oes/special-requests/oesm18nat.zip), [2019](https://www.bls.gov/oes/special-requests/oesm19nat.zip), [2020](https://www.bls.gov/oes/special-requests/oesm20nat.zip), [2021](https://www.bls.gov/oes/special-requests/oesm21nat.zip), [2022](https://www.bls.gov/oes/special-requests/oesm22nat.zip), [2023](https://www.bls.gov/oes/special-requests/oesm23nat.zip), [2024](https://www.bls.gov/oes/special-requests/oesm24nat.zip), [2025](https://www.bls.gov/oes/special-requests/oesm25nat.zip)
6. ONS: Annual Survey of Hours and Earnings, Table 14.7a (Annual pay - Gross), 4-digit SOC 9134, United Kingdom. Office for National Statistics, Annual Survey of Hours and Earnings, Table 14. Licensed under the Open Government Licence v3.0., Office for National Statistics. Editions: [2002](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2002/2002-table-14.zip), [2006](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2006consistentw_007methodology/2006-table-14.zip), [2010](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2010revised/2010-revised-table-14.zip), [2011](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2011revisedbasedonsoc2010/2011-revised-table-14.zip), [2015](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2015/table142015revised.zip), [2020](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2020revised/table142020revised.zip)
7. [ONS: Annual Survey of Hours and Earnings, Table 14.7a (Annual pay - Gross), 4-digit SOC 9132, United Kingdom, 2022. Office for National Statistics, Annual Survey of Hours and Earnings, Table 14. Licensed under the Open Government Licence v3.0.](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2022revised/ashetable142022revised.zip), Office for National Statistics
8. [ONS: Annual Survey of Hours and Earnings, Table 14.7a (Annual pay - Gross), 4-digit SOC 9132, United Kingdom, 2025. Office for National Statistics, Annual Survey of Hours and Earnings, Table 14. Licensed under the Open Government Licence v3.0.](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2025provisional/ashetable142025provisional.zip), Office for National Statistics
9. [ABS: Labour Force, Australia, Detailed, table EQ08 (Employed persons by Occupation unit group, ANZSCO 2013), latest release](https://www.abs.gov.au/statistics/labour/employment-and-unemployment/labour-force-australia-detailed/latest-release), Australian Bureau of Statistics

### Wage series

10. [University of Missouri Libraries — "Prices and Wages by Decade: 1950-1959" (BLS factory workers earnings; semi-skilled food/packaging operative ~$1.30-1.50/hr)](https://libraryguides.missouri.edu/pricesandwages/1950-1959), University of Missouri Libraries / BLS historical sources
11. [BLS — "Forty years of falling manufacturing employment" (production worker wages at manufacturing peak, 1979-1980; packaging operative estimated at $7/hr nominal)](https://www.bls.gov/opub/btn/volume-9/forty-years-of-falling-manufacturing-employment.htm), Bureau of Labor Statistics
12. BLS OEWS, national cross-industry estimates (flat file), Bureau of Labor Statistics. Editions: [2003](https://www.bls.gov/oes/special-requests/oesm03nat.zip), [2004](https://www.bls.gov/oes/special-requests/oesm04nat.zip), [2005](https://www.bls.gov/oes/special-requests/oesm05nat.zip), [2006](https://www.bls.gov/oes/special-requests/oesm06nat.zip), [2007](https://www.bls.gov/oes/special-requests/oesm07nat.zip), [2008](https://www.bls.gov/oes/special-requests/oesm08nat.zip), [2009](https://www.bls.gov/oes/special-requests/oesm09nat.zip), [2010](https://www.bls.gov/oes/special-requests/oesm10nat.zip), [2011](https://www.bls.gov/oes/special-requests/oesm11nat.zip), [2012](https://www.bls.gov/oes/special-requests/oesm12nat.zip), [2013](https://www.bls.gov/oes/special-requests/oesm13nat.zip), [2014](https://www.bls.gov/oes/special-requests/oesm14nat.zip), [2015](https://www.bls.gov/oes/special-requests/oesm15nat.zip), [2016](https://www.bls.gov/oes/special-requests/oesm16nat.zip), [2017](https://www.bls.gov/oes/special-requests/oesm17nat.zip), [2018](https://www.bls.gov/oes/special-requests/oesm18nat.zip), [2019](https://www.bls.gov/oes/special-requests/oesm19nat.zip), [2020](https://www.bls.gov/oes/special-requests/oesm20nat.zip), [2021](https://www.bls.gov/oes/special-requests/oesm21nat.zip), [2022](https://www.bls.gov/oes/special-requests/oesm22nat.zip), [2023](https://www.bls.gov/oes/special-requests/oesm23nat.zip), [2025](https://www.bls.gov/oes/special-requests/oesm25nat.zip)
13. [BLS OEWS May 2024, national cross-industry estimates (flat file)](https://www.bls.gov/oes/special-requests/oesm24nat.zip), U.S. Bureau of Labor Statistics
14. ONS: Annual Survey of Hours and Earnings, Table 14.7a (Annual pay - Gross), 4-digit SOC 9134, United Kingdom. Office for National Statistics, Annual Survey of Hours and Earnings, Table 14. Licensed under the Open Government Licence v3.0., Office for National Statistics. Editions: [2002](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2002/2002-table-14.zip), [2006](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2006consistentw_007methodology/2006-table-14.zip), [2010](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2010revised/2010-revised-table-14.zip), [2011](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2011revisedbasedonsoc2010/2011-revised-table-14.zip), [2015](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2015/table142015revised.zip), [2020](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2020revised/table142020revised.zip)
15. [ONS: Annual Survey of Hours and Earnings, Table 14.7a (Annual pay - Gross), 4-digit SOC 9132, United Kingdom, 2022. Office for National Statistics, Annual Survey of Hours and Earnings, Table 14. Licensed under the Open Government Licence v3.0.](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2022revised/ashetable142022revised.zip), Office for National Statistics
16. [ONS: Annual Survey of Hours and Earnings, Table 14.7a (Annual pay - Gross), 4-digit SOC 9132, United Kingdom, 2025. Office for National Statistics, Annual Survey of Hours and Earnings, Table 14. Licensed under the Open Government Licence v3.0.](https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/earningsandworkinghours/datasets/occupation4digitsoc2010ashetable14/2025provisional/ashetable142025provisional.zip), Office for National Statistics
17. [Jobs and Skills Australia: Other Machine Operators (ABS Survey of Employee Earnings and Hours, May 2025)](https://www.jobsandskills.gov.au/data/occupation-and-industry-profiles/occupations/7119-other-machine-operators), Jobs and Skills Australia / Australian Bureau of Statistics

### Tool eras

18. [Sealed Air — "The History of Protective Packaging: Bubble Wrap and Beyond" (early packaging machinery context, 1883-1920s)](https://dam.sealedair.com/asset/f7a6d08a-7b64-48b5-857e-61d1678e1164/History-jpg.jpg), Sealed Air Corporation
19. [Wikipedia — Tetra Pak (founded in Lund, Sweden 1951 by Ruben Rausing; first filling machine delivered 1952; Erik Wallenberg tetrahedron invention; international commercial deployment 1954 onward)](https://en.wikipedia.org/wiki/Tetra_Pak), Wikipedia
20. [PMMI — About PMMI, The Association for Packaging and Processing Technologies (case erector and blister-pack historical context, packaging industry timeline)](https://www.pmmi.org/about), PMMI — The Association for Packaging and Processing Technologies
21. [Wikipedia — Barcode (UPC first commercial scan: June 26, 1974, Marsh Supermarket, Troy Ohio; Wrigley's Juicy Fruit gum)](https://en.wikipedia.org/wiki/Barcode), Wikipedia
22. [Wikipedia — Keyence Corporation (founded 27 May 1974 by Takemitsu Takizaki, Osaka, Japan; FA sensors, machine vision systems, and factory automation products)](https://en.wikipedia.org/wiki/Keyence), Wikipedia
23. [Wikipedia — Cognex Corporation (founded 1981 by Robert J. Shillman, Bill Silver, and Marilyn Matz; DataMan 1982 first product)](https://en.wikipedia.org/wiki/Cognex_Corporation), Wikipedia
24. [Lean Enterprise Institute — "Single Minute Exchange of Die" lexicon entry (Shigeo Shingo SMED methodology; internal vs external setup, changeover under 10 minutes)](https://www.lean.org/lexicon-terms/single-minute-exchange-of-die/), Lean Enterprise Institute
25. [Krones AG — Company History (Krones founded 1951 by Hermann Kronseder; 2000 introduced first aseptic filling line; servo and digital packaging line milestones)](https://en.wikipedia.org/wiki/Krones), Wikipedia / Krones AG
26. [Universal Robots — Company (first collaborative robot sold 2008; UR5 cobot; packaging and pick-and-place applications)](https://www.universal-robots.com/company/), Universal Robots
27. [Wikipedia — MindSphere (Siemens industrial IoT platform, launched 2016; cloud-based, aggregates sensor data from manufacturing equipment)](https://en.wikipedia.org/wiki/MindSphere), Wikipedia

### Forecasts and exposure studies

28. [BLS Employment Projections 2025-35, National Employment Matrix: 51-9111 Packaging and filling machine operators and tenders (2025: 377.7 thousand; 2035: 393.3 thousand; +4.1%)](https://data.bls.gov/projections/nationalMatrix?queryParams=51-9111&ioType=o), Bureau of Labor Statistics
29. [Frey & Osborne (2013), "The Future of Employment: How Susceptible Are Jobs to Computerisation?", Appendix (SOC 51-9111 Packaging and Filling Machine Operators and Tenders: probability 0.98, rank 681 of 702)](https://oms-www.files.svdcdn.com/production/downloads/academic/The_Future_of_Employment.pdf), Oxford Martin School, University of Oxford
30. [Eloundou, Manning, Mishkin & Rock (2023), "GPTs are GPTs", occupation-level exposure data occ\_level.csv (O\*NET-SOC 51-9111.00, human-rated β 0.075)](https://github.com/openai/GPTs-are-GPTs/blob/main/data/occ_level.csv), OpenAI

### Historical notes

31. [PMMI — About PMMI, The Association for Packaging and Processing Technologies (US packaging machinery industry history, multi-wall bag machines 1920s)](https://www.pmmi.org/about), PMMI — The Association for Packaging and Processing Technologies
32. [Wikipedia — Tetra Pak (Erik Wallenberg tetrahedron invention; Ruben Rausing patent; founded Lund Sweden 1951; first filling machine 1952)](https://en.wikipedia.org/wiki/Tetra_Pak), Wikipedia
33. [Wikipedia — Sealed Air Corporation (Bubble Wrap accidental invention 1957; Fielding and Chavannes; Sealed Air founded 1960)](https://en.wikipedia.org/wiki/Sealed_Air), Wikipedia
34. [Wikipedia — Barcode (Wrigley's Juicy Fruit gum, June 26 1974, first commercial UPC scan at Marsh Supermarket Troy Ohio)](https://en.wikipedia.org/wiki/Barcode), Wikipedia
35. [Wikipedia — Cognex Corporation (founded 1981, Robert J. Shillman + Bill Silver + Marilyn Matz; DataMan 1982)](https://en.wikipedia.org/wiki/Cognex_Corporation), Wikipedia
36. [Frey & Osborne (2013) — "The Future of Employment: How Susceptible Are Jobs to Computerisation?" (Oxford Martin School)](https://oms-www.files.svdcdn.com/production/downloads/academic/The_Future_of_Employment.pdf), Oxford Martin School
37. [Wikipedia — MindSphere (Siemens industrial IoT platform, launched 2016)](https://en.wikipedia.org/wiki/MindSphere), Wikipedia
38. [BLS National Employment Matrix — 51-9111 (2024-34 projections: +4.5%; O\*NET 51-9111.00: $40,900 median annual wage 2024)](https://data.bls.gov/projections/nationalMatrix?queryParams=51-9111&ioType=o), Bureau of Labor Statistics

### Predecessors & successors

39. [BLS — SOC 53-7064 Packers and Packagers, Hand (adjacent occupation; historical promotion path to machine-tending roles)](https://www.bls.gov/ooh/transportation-and-material-moving/hand-laborers-and-material-movers.htm), Bureau of Labor Statistics

### Present-day analysis

- [O\*NET 30.3 -- Packaging and Filling Machine Operators and Tenders (51-9111.00)](https://www.onetonline.org/link/summary/51-9111.00), accessed 2026-06-03
- [Eloundou et al. 2024 -- GPTs are GPTs (Science)](https://arxiv.org/abs/2303.10130), accessed 2026-06-03
- [BLS OEWS May 2024 -- Packaging and Filling Machine Operators (SOC 51-9111)](https://www.bls.gov/oes/2023/may/oes519111.htm), accessed 2026-06-03
- [Cognex -- AI-Powered Packaging Integrity and Inspection](https://www.cognex.com/en/applications/automated-defect-detection/packaging-inspection/packaging-integrity-and-inspection), accessed 2026-06-03
- [Cognex -- In-Sight 3800 AI Vision System (Machine Design, 2025)](https://www.machinedesign.com/automation-iiot/article/55339763/cognex-cognex-in-sight-3800-vision-system-ai-powered-quality-inspection-and-automation), accessed 2026-06-03
- [Rockwell Automation -- Advancements in Predictive Maintenance and IIoT](https://www.rockwellautomation.com/en-us/company/news/the-journal/advancements-in-predictive-maintenance-and-iiot.html), accessed 2026-06-03
- [Apex Filling -- Smart Factories in 2026: What Your Filling Line Needs to Compete](https://blog.apexfilling.com/smart-factories-in-2026-what-your-filling-line-needs-to-compete), accessed 2026-06-03
- [Packaging Europe -- Cognex aims to enhance packaging inspection with AI-based vision system](https://packagingeurope.com/news/cognex-aims-to-enhance-inspection-with-ai-based-vision-system/9661.article), accessed 2026-06-03
- [BLS Career Outlook 2026 -- Producing the goods of the future: Job opportunities in manufacturing](https://www.bls.gov/careeroutlook/2026/article/manufacturing.htm), accessed 2026-06-03
- [MSSC -- Certified Production Technician (CPT) credential](https://www.msscusa.org/certification/cpt/), accessed 2026-06-03

How to read these figures: https://futurehistory.earth/methodology. Every figure links to its own source; gaps stay gaps.