Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1990-08-09
1993-05-11
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
Patent
active
D03355403
REFERENCES:
patent: D238320 (1976-01-01), Smith
patent: D270474 (1983-09-01), Haines et al.
patent: D270590 (1983-09-01), Berlic
patent: 818266 (1906-04-01), Leuz
patent: 3703939 (1972-11-01), Maxwell
patent: 4614252 (1986-09-01), Tarner
patent: 4625831 (1986-12-01), Kodgers, Jr.
patent: 4722420 (1988-02-01), Arthurs et al.
patent: 4905792 (1990-03-01), Wilson
Clark Doris
Gilden Leon
Word A. Hugo
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