Self-levelling ladder
United States Patent 2890823
US Patent References:
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Inventors:
Bendick, Jack W.
Publication Date:
06/16/1959
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Assignee:
Bendick, Jack W.
Primary Class:
182/105
Other Classes:
182/176, 182/200
International Classes:
E06C7/44; E06C7/00
US Patent References:
1087286
2054690Trestle ladder lock
2129401Flexible utility ladder
2221264Stepladder
Foreign References:
AU543333A
CH126132A
GB230601A