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Filter: Subject of engineering
| Date: | 1911 |
|---|---|
| Description: | Men in suits and hats follow along as a man plows with a Holt crawler tractor at the Winnipeg tractor contest in Canada. Another man in the foreground is p... |
| Date: | 1944 |
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| Description: | William Koppa uses a microscope to examine a specimen of steel. The original caption reads: "Micro-photography is employed at International Harvester's Gas... |
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