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Railroad-Switch (open access)

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 (open access)

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