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Coupling

Description: This patent is for a new coupling system to connect hollow pipes. It is specifically designed to address issues of vibration, which cause the coupling pin to become damaged.
Date: July 10, 1919
Creator: Hiegel, Joseph L.
Partner: UNT Libraries Government Documents Department

Battery.

Description: Patent for an improvement to batteries, particularly pertaining to their electrochemical components, including an illustration and instructions.
Date: June 10, 1919
Creator: Crowley, Richard Joseph
Partner: UNT Libraries Government Documents Department
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