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Permutation Lock.

Description: Patent for a new and improved combination lock. This design "consists in the construction and novel arrangement of the slotted bolt, follower, and follower-shaft, the elongated bolt-stop pivoted in the slot of the bolt, the radially-slotted disks having concentric stems on the follower-shaft, and the lettered or figured and graduated stem-caps engaging the respective stems by means of circular series of teeth" (lines 20-27).
Date: December 12, 1882
Creator: Saxon, James W.
Partner: UNT Libraries Government Documents Department

Permutation Lock.

Description: Patent for a new and improved combination lock. This design's operation "is as follows: Being unlocked, the bolt is in the retracted position . . . [t]he door can then be operated in the usual manner, being held, when closed, by the ordinary spring-bolt. . . . When the door is closed, in order to lock it, the graduated knob is turned, operating the toothed disk and the first or governing ring, which will . . . throw out the end of the locking-bolt. By turning the handle, all the rings of the s… more
Date: April 17, 1883
Creator: Sarlls, Rutus & Holland, Virgil C.
Partner: UNT Libraries Government Documents Department

Permutation Lock.

Description: Patent for a new and improved combination lock. This design "consists in the construction and novel arrangement of the elongated case, its longitudinally slotted and notched partitions, the boltway over the partitions, reciprocating notched and perforated slides, and adjustable pins or studs engaging the perforations and projecting into the slots of the partitions, the rack-slide, drop-bolt, and graduated knob carrying the pinion" (lines 20-28).
Date: April 24, 1883
Creator: Sarlls, Rutus & Holland, Virgil C.
Partner: UNT Libraries Government Documents Department

Permutation-Lock

Description: Patent for an improvement in the science of combination locks. Illustrations and instructions are included.
Date: unknown
Creator: Schuetze, Robert
Partner: UNT Libraries Government Documents Department

Door Check

Description: Patent for a door-check, which will hold the door in any position it is placed.
Date: October 15, 1901
Creator: Neher, John F. & Neher, Noah N.
Partner: UNT Libraries Government Documents Department

Door-Check

Description: Patent for a door check that holds a door open in a secured position. This particular door securer has a manual operation lock independent of the knob-spindle.
Date: February 24, 1903
Creator: Skidmore, John C. & Tyer, Author
Partner: UNT Libraries Government Documents Department

Door Stop and Lock.

Description: Patent for a door lock and door stop that is operated from the doorknob by having a rod with a bolted door stop box on the bottom inserted into the door frame.
Date: April 9, 1907
Creator: Tatum, Cicero James
Partner: UNT Libraries Government Documents Department

Door.

Description: Patent for a door for bathrooms that adjoin two rooms that turns a partition door around 180 degrees when a person enters the bathroom and has locks to prevent the entrance of a person from the other room.
Date: April 5, 1910
Creator: Van Zandt, John H.
Partner: UNT Libraries Government Documents Department

Door Operating and Locking Device.

Description: Patent for an electric door or gate operating and locking device that allows for automatically opening and closing a door or gate and locking it when it is open or closed. This device may be turned off if necessary to allow for manually moving the door or gate and may be installed cheaply in preexisting structures.
Date: May 18, 1915
Creator: Pitts, Hood
Partner: UNT Libraries Government Documents Department

Door-Lock

Description: Patent for a lock which can be attached to either a right-hand or left-hand door and operated from either side. When locked from the inside, a shutter will prevent the door from being unlocked from the outside until released again from the inside.
Date: January 12, 1915
Creator: Wilson, Ira W.
Partner: UNT Libraries Government Documents Department

Dam Construction

Description: Patent for a movable dam wall shorter than the depth of the water behind it, including illustrations.
Date: March 3, 1914
Creator: Hunt, Edward B.
Partner: UNT Libraries Government Documents Department
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