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Double-Lever Brake.
Patent for "new and useful improvements in Double-Lever Brakes." (lines 6-7) and how the invention will provide more power to the brake and equally distribute that power. Includes illustrations.
Date:
March 23, 1920
Creator:
Roberts, George P.
System:
The Portal to Texas History
Covertible Stock and Freight Car.
Patent for an improved process of constructing convertible stock and freight train cars, including illustrations.
Date:
May 4, 1920
Creator:
Wyatt, Everett
System:
The Portal to Texas History
Paper Clip.
Patent for new and useful improvements in a paper clip. This invention relates to a paper clip a has for its principal object the production of a simple and efficient device for holding numbers sheets of paper together.
Date:
October 21, 1920
Creator:
Holt, Frank P.
System:
The Portal to Texas History
Valve-Lifter
Patent for an improved device that can be applied to a valve spring plate without losing grip.
Date:
April 8, 1920
Creator:
Chaney, Robert
System:
The Portal to Texas History
Cold Process of Repairing Radiators of Internal-Combustion Engines.
Patent for repairing breaks in radiator pipes caused by freezing, by which can be repaired quickly and efficiently at a low cost.
Date:
May 18, 1920
Creator:
Henderson, Thomas E.
System:
The Portal to Texas History