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Degree Department
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3 Matching Results
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Wrist Blotter
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.
System:
The Portal to Texas History
Rock-Drill.
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.
System:
The Portal to Texas History
Relief Valve Gear
Patent for relief valve gear. Illustration included.
Date:
October 1, 1912
Creator:
Edwards, George F. & Tilson, Martin D.
System:
The Portal to Texas History