Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1983-08-16
1986-03-25
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Patent
active
D02831686
REFERENCES:
patent: D265251 (1982-06-01), Darby et al.
patent: 3090489 (1963-05-01), Smith
patent: 3578110 (1971-05-01), Seagraves
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