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Wrench.
Patent for a wrench specifically made to remove well drill bits from the drill.
Date:
April 13, 1920
Creator:
Stover, Willard L.
System:
The Portal to Texas History
Priming Cup for Internal Combustion Motors
Patent for "Improvements in Priming-Cups for Internal-Combustion Motors" (lines 4-5) including illustrations.
Date:
February 3, 1920
Creator:
Martinek, Stanley A.
System:
The Portal to Texas History
Guard.
Patent for a guard for marine vessels against torpedoes.
Date:
September 21, 1920
Creator:
Muncy, David J.
System:
The Portal to Texas History