Title:
EXTENSIBLE ESCAPE LADDER
Document Type and Number:
United States Patent 3485322

Inventors:
Trefz, Otto F.
Publication Date:
12/23/1969
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Assignee:
Otto, Trefz F.
Primary Class:
182/189
Other Classes:
182/52
International Classes:
E06C1/38; E06C1/00; A62B1/20; A62C31/24
US Patent References:
0144690
0188234
2659702***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
3026962Ladder
3134567Scaffolding


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