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Phonograph-Machine.
Patent for a new phonograph machine with improvements of sound-box-transversing mechanisms and uniformity of movements, including illustrations.
Date:
April 17, 1906
Creator:
Dubinski, Benjamin.
System:
The Portal to Texas History
Piston Ring
Patent for improvements to piston rings to reduce leakage through piston grooves, rings, and joints.
Date:
April 17, 1920
Creator:
Olsen, Jens J. & Edwards, Lewis E.
System:
The Portal to Texas History