Title:
Portable mast
Document Type and Number:
United States Patent 2847097

Inventors:
Moore, Dewey R.
      Plaque It!

Sponsored by:
Flash of Genius
Publication Date:
08/12/1958
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Referenced by:
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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:
2268796Sectional derrick
2345253Portable derrick
2364851Collapsible support
2405794Portable derrick
2412678Telescopic, tubular plywood mast and method of making the same
2413149Portable derrick
2472359Oil well drilling apparatus having crown block movable lengthwise of mast
2542176Raising boom
2577642Oil well derrick
2781108Self-erecting derrick


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