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Envelop.

Description: Patent for an envelope that employs a lock and seal mechanism to increase security of contents. The envelope cannot be opened without tampering or mutilating the envelope.
Date: January 26, 1915
Creator: Wallace, Curtis C.
Partner: UNT Libraries Government Documents Department

Automatic Trailing Device

Description: Patent for an automatic trailing device. This device is made to "successfully follow the tracks of the front vehicle without the use of a driver on the vehicle in tow" (lines 14-17).
Date: February 24, 1920
Creator: Sloan, Charles Lee
Partner: UNT Libraries Government Documents Department

Air-Gun

Description: Patent for an air gun. Illustrations included.
Date: June 21, 1910
Creator: Heckman, George E.
Partner: UNT Libraries Government Documents Department

Cotton-Boll-Cleaning Machine.

Description: Patent for a more practical and compact cotton boll cleaning or ginning machine.
Date: September 7, 1920
Creator: Lokey, Allen T.
Partner: UNT Libraries Government Documents Department

Car Coupling

Description: Patent for train car coupling. Illustration included.
Date: January 17, 1905
Creator: Jones, Evan S.
Partner: UNT Libraries Government Documents Department

Combined Rat and Mouse Trap.

Description: Patent for a cheaper and more effective trap that displays live bait but is unreachable to animals. The trap will make it "impossible for animals to escape after they have been captured" (lines 26-28), including illustrations.
Date: March 7, 1916
Creator: Bevers, William S., Jr.
Partner: UNT Libraries Government Documents Department
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