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Primary view of Piston for Deep Well Pumps
Humason, Granville A.; Bashara, Sam F. & Barraco, Paul J.
February 22, 1921
Primary view of Strain Jacket for Telephone Poles
McKnight, William M.
February 22, 1921
Primary view of Boring-Tool for Oil-Wells and the Like.
Belcher, Mark
February 15, 1921
Primary view of Apparatus For Forcing Fluid From Wells.
Bodungen, Charles G.
February 22, 1921
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