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Spark-Arrester.

Description: Patent for concepts and designs used to improve performance of Spark-Arresters used in the smoke stacks of locomotives with illustrations and instructions.
Date: April 6, 1880
Creator: Wiggin, John E.
Partner: UNT Libraries Government Documents Department

Nut Locking Device.

Description: Patent for a new and improved nut-locking device to securely lock fish plates to rail ends.
Date: April 6, 1920
Creator: Hales, Wiley J.
Partner: UNT Libraries Government Documents Department

Means for Detachably Securing Chairs to Floors.

Description: Patent for a new device that secures chairs to the floor and is easily detachable so the chairs can be moved when necessary.
Date: April 6, 1920
Creator: Lambert, Joseph A.
Partner: UNT Libraries Government Documents Department

Polishing-Machine

Description: Patent for improvements in polishing machines for "polishing marble and other similar stones... and giving a smooth surface to any material of like character." Invention provides a "movable abrading member...and comprehends and mechanism whereby said member may be automatically moved back and forth over the surface to be polished."
Date: April 6, 1915
Creator: Giesberg, John G.
Partner: UNT Libraries Government Documents Department

Device for Taking Samples from Wells.

Description: Patent for the development of a drill bit "specially designed for the purpose of obtaining samples of the formation through which the drill bit is passing" (lines 14-16).
Date: April 6, 1920
Creator: Dodds, Redus D.
Partner: UNT Libraries Government Documents Department

Washing Machine

Description: Patent for a washing machine. Illustration included.
Date: April 6, 1909
Creator: Hamilton, Walter Scot & Williams, James Rozier
Partner: UNT Libraries Government Documents Department
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