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Pump-Barrel Attachment.

Description: Patent for a pump barrel attachment, which has a trap to catch any material falling off the valve.
Date: September 13, 1910
Creator: Riddle, William Nelson
Partner: UNT Libraries Government Documents Department

Safety-Valve

Description: Patent for a safety valve that can be used on water and gas boilers.
Date: June 21, 1892
Creator: Ball, John W.
Partner: UNT Libraries Government Documents Department
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