Supporting device
United States Patent 3011587
US Patent References:
Derrick safety appliance
- - 1782701

Rungless ladder
- - 1918293

Safety cage for workmen
- - 2076810

Hoist
- - 2419145

Welding chair
- - 2854292


Inventors:
Mallog, Peter H.
Publication Date:
12/05/1961
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Assignee:
Mallog, Peter H.
Primary Class:
182/150
Other Classes:
182/187
International Classes:
E04G5/04; E04G5/00