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Grain-Drill Attachment.

Description: Patent for combining a plow and a grain drill into one device, to reduce the number of times the soil needs to be turned per planting.
Date: August 29, 1915
Creator: McAdams, William J.
Partner: UNT Libraries Government Documents Department

Film Feeding Mechanism for Cameras

Description: Patent for a film feeding mechanism for cameras. Illustrations included.
Date: August 6, 1912
Creator: Caldwell, Elmer A.
Partner: UNT Libraries Government Documents Department
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