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Phonograph-Machine.

Description: 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.
Partner: UNT Libraries Government Documents Department

Piston Ring

Description: 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.
Partner: UNT Libraries Government Documents Department
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