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Wagon Unloading Device
Patent for "Improvements in Wagon-Unloading Devices" including illustrations.
Date:
February 3, 1920
Creator:
Ford, John Owen
System:
The Portal to Texas History
Piston-Ring
Patent for compound piston rings with an improved fit.
Date:
November 30, 1920
Creator:
Hall, Samuel J.
System:
The Portal to Texas History