Resource Type
States
Counties
3 Matching Results
Results open in a new window/tab.
Results:
1 - 3 of
3
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
Combined Feeder and Hive Ventilator
Patent for improvements in bee-hives by providing means in which the hive can be ventilated during warm weather. The invention provides means in which the ventilating means can be removed or rendered inoperative whenever desired or during cold weather.
Date:
November 7, 1922
Creator:
Heim, Charles; Heim, Emil R.; Heim, Clarence C. & Heim, Edwin C.
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