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Wrench.
Patent for wrench related device "for locking the gripping element after it is applied to the pipe or other pipe (lines 14-15)" including instructions and illustration.
Date:
October 19, 1915
Creator:
Black, Lee J.
System:
The Portal to Texas History
Variable-Speed-Transmission Gearing.
Patent for an improved transmission gearing that provides "variable speed transmission gearing" (line 10) which allows for different forward and reverse speeds, including illustrations. The variable speed transmission gearing is designed primarily for automobiles and motor vehicles.
Date:
October 5, 1915
Creator:
Maschek, Henry
System:
The Portal to Texas History