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Means for Reducing Wear in the Working Barrels of Pumps
Patent for a means of reducing wear in the working barrels of pumps. The pumps made in this wat are specially adapted for operations in water or oil wells where the fluid being pumped is is mixed with sand and sediment.
Date:
March 4, 1919
Creator:
Carmichael, Robert E.
System:
The Portal to Texas History
Rotary Boring Drill
Patent for a rotary boring drill to be used in mining and drilling.
Date:
March 4, 1919
Creator:
Carmichael, R. E.
System:
The Portal to Texas History