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Railroad-Switch
Patent for a railroad switch that is easier to use and more effective than the "common stub switch" (lines 10-11), thereby reducing damage.
Date:
December 16, 1919
Creator:
Cuellar, Samuel D.
System:
The Portal to Texas History
Silo Construction
Patent for silo, with walls constructed out of plastic,
Date:
January 16, 1917
Creator:
Pierson, Ludvig B.
System:
The Portal to Texas History