Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1990-06-27
1993-04-27
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Patent
active
D03351882
REFERENCES:
patent: D306348 (1990-02-01), Baumeister
patent: 2723674 (1955-11-01), Harris
patent: 3232377 (1966-02-01), Smith
patent: 3282375 (1966-11-01), Ray
patent: 4134474 (1979-01-01), Stavenor et al.
patent: 4246981 (1981-01-01), Stavenar
patent: 4274508 (1981-06-01), Hughes et al.
patent: 4699248 (1987-10-01), Roy
Clark Doris
Gilden Leon
Word A. Hugo
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