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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
Rail Plate And Fastener
Patent for rail plate fastener. This invention is designed to secure rails to ties without the use of spikes. Illustration included.
Date:
June 21, 1904
Creator:
Butterfield, Walter V.
System:
The Portal to Texas History