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Expansion-Plug.
Patent for "an expansion plug wherein a traveling nut cooperates with a screw to expand or contract a sectional plug" (lines 8-11) with illustration.
Date:
May 21, 1918
Creator:
Barlow, Walter S.
System:
The Portal to Texas History
Warehouse Truck
Patent for improving hand truck, aiming to increase the carrying capacity of the truck.
Date:
May 30, 1916
Creator:
Dickson, Braxton B.
System:
The Portal to Texas History