Resource Type
Counties
3 Matching Results
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Clamp
Patent for clamps used in framing and forming of concrete construction. The clamps are easily removed and reused eliminating the need for wooden framing used in the past.
Date:
February 24, 1920
Creator:
Ferguson, William D.
System:
The Portal to Texas History
Tractor.
Patent for an improvement in tractors that allowed adjustment to the tread or allowed distance between traction elements.
Date:
February 10, 1920
Creator:
Franklin, Floyd P.
System:
The Portal to Texas History
Separator for Secondary Batteries.
Patent for separators, made of celluloid or similar material, designed to separate secondary or storage batteries in an efficient and affordable way.
Date:
February 17, 1920
Creator:
Luthy, Josesph O.
System:
The Portal to Texas History