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Train-Order Holder.
Patent for Train-Order Holder designed to keep sheets of paper secure and in place to prevent writing on margins and displacement.
Date:
November 30, 1920
Creator:
Crady, Daniel R.
System:
The Portal to Texas History
Railroad-Signal
Patent for a railroad signal which will prevent train collisions at railway crossings, with illustrations.
Date:
February 17, 1920
Creator:
Humphrys, Sidney E.
System:
The Portal to Texas History