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in subjects: "Oil well drilling"  
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Primary view of Pump-Piston.
Coulson, William J.
May 4, 1920
Primary view of Pump
Scott, Floyd L.
April 23, 1920
Primary view of Pump.
Carden, David A.
April 13, 1920
Primary view of Oil Well Screen.
Dobson, John A.
February 14, 1922
Primary view of Fishing-Tool
McMillian, John F.
December 21, 1920
Primary view of Elevator.
Steen, Buford J.
January 20, 1920
Primary view of Sample-Taking Device.
Christian, Walton G.
May 24, 1921
Primary view of Reamer.
Hughes, Howard R.
April 23, 1918
Primary view of Reamer.
Humason, Granville A.
April 19, 1921
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