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Tool Joint.
Patent for a screw-threaded tool joint used for drill pipes on rotary drilling rigs.
Date:
August 10, 1920
Creator:
Lyle, Henry Claude
System:
The Portal to Texas History
Dynamo Electric Machine
Patent for Improvement of Dynamo-Electric Machines. The improvement turns electric energy into mechanical entry.
Date:
August 10, 1920
Creator:
Reynolds, William T. & Reynolds, Bruce A.
System:
The Portal to Texas History
Comb.
Patent for an electronic heating comb providing an electric heating element.
Date:
November 10, 1920
Creator:
Caneavri, Joseph Ping.
System:
The Portal to Texas History