Public domain
To save time in checking threads on a twenty-millimeter shell booster, a plant superintendant built this machine. It makes possible a speedy checking of thread accuracy in contract to the old hand method. The inventor made the machine out of fan base and a couple pieces of machine steel in a matter
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Credit lineTo save time in checking threads on a twenty-millimeter shell booster, a plant superintendant built this machine. It makes possible a speedy checking of thread accuracy in contract to the old hand met. 1942-01-01. United States. Office Of War Information. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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