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Pump

Description: Patent for an improvement to lift pumps for deep oil and artesian wells. The improvement is intended to overcome the difficulty of excessive pressure caused by the liquid rising to the surface that makes foot valve inoperable. The design also makes the pump easier to construct as well as stronger and more durable.
Date: February 15, 1916
Creator: Haar, G. E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Railroad-Signal

Description: Patent for a railroad signal which will prevent train collisions at railway crossings, with illustrations.
Date: February 17, 1920
Creator: Humphrys, Sidney E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Pipe and Like Stem.

Description: Patent for improved smoking equipment stems which prevents saliva from running down the stem. The end of the stem has a new design which extends upwards and then wraps forward and downward, leaving a slot where no saliva can enter.
Date: February 22, 1921
Creator: Crossman, Alvin Amos
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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