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Aeroplane-Tail.
Patent for improvements to the tail of aeroplanes. This invention is to be used to help control the flight of planes or heavy projectiles, and would not have effects on the equilibrium or be difficult to use.
Date:
January 18, 1921
Creator:
Joseph, M. Krowka
System:
The Portal to Texas History
Well-Drilling Machine.
Patent for an oil well drilling machine, designed to be easy to use and inexpensive to construct.
Date:
February 22, 1921
Creator:
Bradshaw, Albert Cidney
System:
The Portal to Texas History