Pump.
Description:
Patent for a pump for deep wells with a "specially constructed piston capable of a powerful working stroke and which will secure at all times a full volume of liquid at each stroke of the pumping rod." (line 25) including instructions and illustrations.
Date:
July 6, 1920
Creator:
Humason, Granville Allison
Item Type:
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Partner:
UNT Libraries Government Documents Department