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Piston-Ring.
Patent for metallic piston rings to allow for expansion and contraction without leakage.
Date:
June 15, 1920
Creator:
Jordan, Robert M.
System:
The Portal to Texas History
Rail Joint and Brace.
Patent for an improvement to rail joint structures that extends structural longevity by bracing the rails against each other.
Date:
June 1, 1920
Creator:
Buck, Landon A.
System:
The Portal to Texas History