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Piston

Description: Patent for a piston for use in pumps.
Date: February 25, 1913
Creator: Frank, Gustav
Partner: UNT Libraries Government Documents Department

Switch Lock for Motor Vehicles.

Description: Patent for "certain new and useful improvements in Switch-Locks for motor vehicles", including instructions and illustrations.
Date: February 20, 1917
Creator: Frank, Gustav
Partner: UNT Libraries Government Documents Department
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