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Oxygen-Generator
Patent for an oxygen generator that refills as it is emptied.
Date:
February 7, 1911
Creator:
Bradley, Richard Clinton
System:
The Portal to Texas History
Rail-Bond.
Patent for a rail bond that allows an electric current to travel through the rails.
Date:
March 14, 1911
Creator:
Humason, Granville A. & Odell, Edward F.
System:
The Portal to Texas History