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Combined Rule and Square.
Patent for new and useful Improvements in Combined Rules and Squares which makes it "possible to form a rigid straight rule or one or more rigid squares" (lines 24-25), including illustration and instructions.
Date:
August 21, 1917
Creator:
Grossman, Edwin
System:
The Portal to Texas History
Watering-Trough.
Patent for a valve that controls the flow of drinking water from a reservoir or tank into a trough. It can be operated by domestic animals and automatically shuts off when they are finished drinking.
Date:
August 21, 1917
Creator:
Atkinson, George C.
System:
The Portal to Texas History
Tool-Heater
Patent for tool heaters "adapted to heat a soldering iron by gas" (lines 9-10) to increase the heat applied to the tool, including illustrations.
Date:
October 21, 1919
Creator:
Juergens, Ernest
System:
The Portal to Texas History