Ladder extension

Details Ladder extension Ladder extension

1994-12-23

1995-12-05

Clark, Doris

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

Patent

active

D03649300

REFERENCES:
patent: 2503626 (1950-04-01), Mayberry
patent: 3948353 (1976-04-01), Lane
patent: 5027923 (1991-07-01), Derome
patent: 5339920 (1994-08-01), Eriksson

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