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Polished-Rod Clamp.
Patent for improvements in Polished-Rod Clamps that "quickly and easily attached to a rod without the use of tools" (lines 56-57) and "be easily operated at a distance from a pump" (lines 59-60).
Date:
November 8, 1921
Creator:
Weister, Edward P.
System:
The Portal to Texas History
Rotary Moving Picture Machine.
Patent for motion picture machine with interchangeable heads, allowing for change of one reel while the other continues to play undisturbed from same machine.
Date:
November 16, 1920
Creator:
Hansard, Robert L.
System:
The Portal to Texas History