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| Date: | 09 09 1931 |
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| Description: | Lab worker conducting a test at the Oscar Mayer laboratory. |
| Date: | 1924 |
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| Description: | A factory worker makes an adjustment to a large weight on a scale in front of a cloth backdrop. |
| Date: | 1948 |
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| Description: | A lab technician tests binder twine, possibly at the McCormick Twine Mill. Original caption reads: "Resistance to rot, insect and rodent damage, is establi... |
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