Lifting apparatus for construction materials
United States Patent 2717801
US Patent References:
/0593969.html
- - 0593969

/1251456.html
- - 1251456

Hoisting apparatus
- - 2010054


Inventors:
Neil, William P.
Publication Date:
09/13/1955
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Assignee:
Neil, William P.
Primary Class:
294/67.200
Other Classes:
52/289, 294/81.500, 212/234, 52/125.600, 414/10, 294/67.100, 280/79.300
International Classes:
E04G21/16