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Oxygen-Generator

Description: Patent for an oxygen generator that refills as it is emptied.
Date: February 7, 1911
Creator: Bradley, Richard Clinton
Partner: UNT Libraries Government Documents Department

Pipe-Wrench.

Description: Patent for improvements to pipe wrenches to a more simple design.
Date: February 16, 1915
Creator: Lewis, Guy V.
Partner: UNT Libraries Government Documents Department
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