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Specification of Letters Patent.
Patent for improvements in the seals for well screens to provide a permanent joint or seal between the screen and the casing with out blocking passage.
Date:
June 21, 1921
Creator:
Thomson, Alexander
System:
The Portal to Texas History
Pump-Piston.
Patent for new and improved pump piston. This patent is accompanied by drawings and the object is to provide a pump piston wherein the the piston body proper is securely maintained against shifting upon the piston rod.
Date:
March 22, 1921
Creator:
Yount, Miles F.
System:
The Portal to Texas History