Title:
CRANE JIB OR MAST
United States Patent 3509677
Inventors:
Krex, Helge E.
Waerum, Julius N. M.
Publication Date:
05/05/1970
Export Citation:
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Assignee:
Byggeriets, Maskinstationer AS.
Primary Class:
52/646
International Classes:
B66C23/28; B66C23/70; E04H12/18; B66C23/00; E04H12/00; (IPC1-7): E04B1/32; E04C3/38
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US Patent References:
3361456Automatic locking system for telescopic towers
3024877Scaffolds




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