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Wheel Tread.
Patent for wheel treads designed for heavy vehicles. The metal shoes on the tread are to help enable the vehicle to go over both hard and soft surfaces.
Date:
February 8, 1921
Creator:
Ingram, Joseph D.
System:
The Portal to Texas History
Triple-Valve Mechanism.
Patent for a triple-value mechanism that "appertains to automatic fluid pressure brake systems and involves certain improvements &c., &c.” (lines 9-11) including instructions and illustrations.
Date:
December 8, 1914
Creator:
Atwood, Walter F.
System:
The Portal to Texas History