Title:
Portable drilling rig
United States Patent 2848196
Inventors:
Simmonds, Wayne W.
Publication Date:
08/19/1958
Export Citation:
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Assignee:
John, Lucas H.
Primary Class:
175/52
Other Classes:
52/119, 52/121, 173/28, 173/44, 173/147, 173/159, 173/186, 175/85, 175/122, 175/170, 414/22.57
International Classes:
E21B15/00; E21B19/14; E21B15/00; E21B19/00
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US Patent References:
2742260Well derrick
2594098Drilling apparatus
2412020Working platform arrangement for portable derricks
2334312Drilling machine