Extensible ladder

Details Extensible ladder Extensible ladder

1994-12-21

1995-12-19

Clark, Doris

Building units and construction elements

Stair, ladder, scaffold, or similar support

Stepped

Patent

active

D03654028

REFERENCES:
patent: 163580 (1875-05-01), Covel et al.
patent: 886605 (1908-05-01), Hersche
patent: 3315762 (1967-04-01), Torrey
patent: 3858684 (1975-01-01), Goings
patent: 4002223 (1977-01-01), Bernkrant

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