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Valve Structure for Oil-Wells.
Patent for Valve Oil-Wells. This improved Valve Oil Well will increase efficiency and durability of device.
Date:
September 19, 1919
Creator:
McEvoy, John Philip
System:
The Portal to Texas History
Sample Taking Device.
Patent for a device that takes samples of the strata or formation through which a well is being drilled without mixing the soil with water within the reservoir.
Date:
September 19, 1919
Creator:
Rembert, William E.
System:
The Portal to Texas History