Ladder rung expander

Details Ladder rung expander Ladder rung expander

1999-11-02

2000-06-20

Clark, Doris

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

2504

Patent

active

D04268962

REFERENCES:
patent: D409765 (1999-05-01), Armstrong et al.
patent: 4241807 (1980-12-01), McKenna et al.
patent: 5465809 (1995-11-01), Panicci

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