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in subjects: "Gas well drilling"  
Results: 1 - 4
Primary view of Well-Drilling Rig.
Bradford, Robert M.
February 3, 1920
Primary view of Well-Liner Clamp.
Bigelow, Robert J.
May 31, 1921
Primary view of Wheel and Shaft
Hudson, James Condron
October 4, 1921
Primary view of Gripping Device.
Moody, Joseph F.
July 11, 1922
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