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in subjects: "Business, Economics and Finance - Oil and Gas - Oil Fields"  
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Primary view of Well Drilling Machine.
Herdman, Adam H.
February 5, 1918
Primary view of Oil-Tank.
Price, James Bain
July 18, 1911
Primary view of Pump-Jack.
Dayton, William L.
July 15, 1919
Primary view of Oil-Converting Apparatus.
Adams, Joseph H.
October 28, 1919
Primary view of Device for Unscrewing and Withdrawing Pipe.
Fletcher, Harold W.
July 29, 1919
Primary view of Device For Extracting Cores From Wells.
Dodds, Redus D.
January 8, 1918
Primary view of Sample-Taking Device.
Church, Walter Lee
April 15, 1919
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