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Rotary Engine.
Patent for an improved rotary engine which overheats less, reduces the space between the piston and cylinder, and is easy to construct and operate.
Date:
April 27, 1920
Creator:
Jefferies, Charlie Q.
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