UNT Libraries Government Documents Department - 5 Matching Results

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Telephone Attachment.

Description: Patent for a telephone attachment for multi-party lines, which allows the user to hold the line against eavesdropping by other users on the line and let multiple people use the line at the same time.
Date: November 23, 1909
Creator: Mitchell, Charles B.

Horseshoe.

Description: Patent for improvements in horseshoes, which will have two parts that pivot together at the toe. Includes instructions and illustrations.
Date: February 23, 1892
Creator: Custer, George

Cotton-Chopper.

Description: Patent for a new "machine for chopping surplus cotton or corn out of the rows or drills, leaving it in hills at the desired distance apart" (lines 8-11) including instructions and illustrations.
Date: March 23, 1886
Creator: Farley, John C.

Improvement in Bridges.

Description: Patent for an improvement in Bridges and Self-Supporting Roofs and Girders. The invention provides instruction for "the construction of truss-bridges and self supporting roofs and girders"..."by nailing or bolting securely together successive layers of plank joined at different points."
Date: September 23, 1873
Creator: Davis, Benjamin F.

Improvement in Car-Couplings.

Description: Patent for an improved automatic car-coupling, including illustrations.
Date: November 23, 1875
Creator: Harper, Derastus
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