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Counties
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Attachment for Lifting-Jacks
Patent for an attachment for lifting jacks.
Date:
March 28, 1911
Creator:
Porter, Horton B.
System:
The Portal to Texas History
Thermostat.
Patent for a thermostat that automatically regulates temperatures and is operated "in conjunction with an electric current or the like" (lines 12-13) including instructions and illustrations.
Date:
April 28, 1914
Creator:
Hinson, Robert E.
System:
The Portal to Texas History