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Spring-Washer for Piano-Flanges.

Description: Patent for a spring washer for piano flanges that prevents the flanges from becoming loose over time.
Date: December 5, 1911
Creator: Mayor, Enoch Allen
Partner: UNT Libraries Government Documents Department

Coin-Controlled Vending-Machine

Description: Patent for a pencil vending machine that is coin-operated, with illustrations.
Date: September 5, 1911
Creator: Mathes, John W.
Partner: UNT Libraries Government Documents Department
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