Hoisting apparatus
United States Patent 3181707
US Patent References:
/0607202.html
- - 0607202

Derrick
- - 1720714

Portable crane
- - 1782406

Crane
- - 2553955


Inventors:
Janssen, Robert V.
Publication Date:
05/04/1965
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Assignee:
Janssen, Robert V.
Primary Class:
212/202
Other Classes:
212/901, 254/338, 212/292, 212/204
International Classes:
B66C23/20; B66C23/00
Foreign References:
CH347321A