Portable mast
United States Patent 2847097

Inventors:
Moore, Dewey R.
Publication Date:
08/12/1958
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Assignee:
UNITED STATES STEEL CORP
Primary Class:
52/120
Other Classes:
52/637, 52/111
International Classes:
E04H12/18; E04H12/00
US Patent References:
2413149Portable derrick
2472359Oil well drilling apparatus having crown block movable lengthwise of mast
2542176Raising boom
2577642Oil well derrick
2781108Self-erecting derrick