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Filter: Subject of technology
| Date: | 06 29 1938 |
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| Description: | A man operates an International PD-80 power unit mounted on a suction dredge for sand and gravel. The power unit is owned by Roy Deringer of Ithaca, Michig... |
| Date: | 10 12 1938 |
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| Description: | Men work with a Universal crusher, used to crush 400 yards of gravel in 8 hours. The crusher was powered by an International PA-100 power unit owned by E.F... |
| Date: | 01 19 1938 |
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| Description: | A young man stands on a platform above an International PA-80 power unit (converted into a P-100) at a gravel pit owned by Mogg County. |
| Date: | 1937 |
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| Description: | Three men stand on a platform to operate a rock crusher powered by an International PA-50 power unit, which is underneath the platform. The photograph was ... |
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