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Excavator.

Description: Patent for Excavator
Date: March 13, 1917
Creator: Butterfield, Charles S.
Partner: UNT Libraries Government Documents Department

Submarine-Destroyer.

Description: Patent for submarine destroyer that is a projectile of the harpoon type adapted to be dropped from an aeroplane with the purpose to destroy a submarine or other vessel.
Date: November 27, 1917
Creator: Garner, William W.
Partner: UNT Libraries Government Documents Department
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