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Wrist Blotter

Description: Patent for a wrist blotter that provides a simple and inexpensive blotter to be attached to the wrist.
Date: October 1, 1918
Creator: Cardwell, Harland W.
Partner: UNT Libraries Government Documents Department

Rock-Drill.

Description: Patent for a composite rock drill composed of granular metal or minerals held together in a binder to present sharp points for the efficient drilling of rock and other substances.
Date: April 1, 1913
Creator: Blackburn, Julian E.
Partner: UNT Libraries Government Documents Department

Relief Valve Gear

Description: Patent for relief valve gear. Illustration included.
Date: October 1, 1912
Creator: Edwards, George F. & Tilson, Martin D.
Partner: UNT Libraries Government Documents Department
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