Resource Type
Counties
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Incubator
Patent for an incubator designed to maintain temperature automatically.
Date:
September 27, 1921
Creator:
Kovar, Joe
System:
The Portal to Texas History
Gearing.
Patent for a speed transmission device that simply and efficiently changes the gears in an automobile especially at fluctuating speeds.
Date:
September 13, 1921
Creator:
Anderson, Bert
System:
The Portal to Texas History