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Automatic Gas Control for Gas Water-Heaters.
Patent for an automatic control for instantaneous water heaters to control a supply of water and simultaneously an automatic supply of gas to the heater.
Date:
October 7, 1919
Creator:
Hamilton, Paul H.
System:
The Portal to Texas History
Automatic Elevator Gate
Patent for an elevator gate that will automatically be raised or lowered upon ascent or descent of the elevator, with illustrations.
Date:
October 7, 1902
Creator:
McNaught, Ira S.
System:
The Portal to Texas History