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Molding Apparatus
Patent for an improved model of a molding apparatus for producing blocks of concrete that is cheaper to manufacture and more durable and adjustable than its predecessor.
Date:
March 20, 1920
Creator:
Nelson, William E.
System:
The Portal to Texas History
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
Auxiliary Door-Lock
Patent for an auxiliary door lock, that may be used with any type of door, and that is portable, with illustrations.
Date:
March 2, 1920
Creator:
Shirley, William Arthur
System:
The Portal to Texas History