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Excavator.
Patent for Excavator
Date:
March 13, 1917
Creator:
Butterfield, Charles S.
System:
The Portal to Texas History
Submarine-Destroyer.
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.
System:
The Portal to Texas History