Date: | 1950 |
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Description: | Holding a dropper over racks of test tubes, a man in a lab coat aims to place drops in the receptacles. |
Date: | 1949 |
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Description: | A man stands over a device, which he is inspecting. Caption reads: "Madison, Wis. 1949(?). Prof. Oliver P. Watts, retired distinguished authority on the co... |
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