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Plow.

Description: Patent for an improvement to the plow by adjusting various devices for better results.
Date: April 15, 1919
Creator: Kopplin, Otto E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Crank-Axle Adjustment.

Description: Patent for a crank axle adjustment "to simplify and produce and efficient crank axle that will efficiently perform its function in connection with the general structure of a plow or cultivator." (lines 13-17)
Date: June 15, 1920
Creator: Kopplin, Otto E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Brick Kiln

Description: Patent for a brick kiln. Illustration included.
Date: November 15, 1904
Creator: Sonka, Joesph & Metzner, Robert A.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Audiphone

Description: Patent for a audiophone which reproduces sounds at their original volume and timbre through the use of diaphragms vibrated by an electric signal.
Date: October 15, 1907
Creator: Baker, John A.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Automatic Cylindrical Power.

Description: Patent for a new and improved cylindrical power-source. This design "consists in the combination of a cylindrical slotted frame with a series of blades which are connected together in pairs, and which are alternately forced through the slots in the frame to receive the force of the wind or water and then retracted, so that they will offer no resistance during a portion of the revolution of the frame. . . . The object of [the] invention is to produce a motor which is adapted for use either as a … more
Date: November 15, 1881
Creator: Hutchinson, Thomas E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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