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Counties
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Mail-Handling Device.
Patent for a mail handling device that mounts into a train car to assist in loading and unloading of mail bags.
Date:
September 11, 1917
Creator:
Kost, Joseph L.
System:
The Portal to Texas History
Pump.
Patent for an improvement in pumps and "has for its object the provision of a pump providing a counterbalance for the weight of the column of liquid in the suction pipe provided by a vacuum chamber in the pump" (lines 10-14). Illustration included.
Date:
November 11, 1919
Creator:
Haszinger, George Ernest
System:
The Portal to Texas History
Spring-Wheel
Patent for a spring wheel designed to resist weight pressure. Illustrations included.
Date:
April 11, 1911
Creator:
Hayden, Walter
System:
The Portal to Texas History