Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1991-10-11
1993-04-27
Douglas, Alan P.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Patent
active
D03351890
REFERENCES:
patent: D270951 (1983-10-01), Cryar
patent: D306487 (1990-03-01), Fowler, Jr.
patent: D306488 (1990-03-01), Mosburg
patent: 4549633 (1985-10-01), Merritt
patent: 4595076 (1986-06-01), Gober
patent: 4596309 (1986-06-01), Venson
patent: 4953662 (1990-09-01), Porter
Saeva Donna L.
Saeva Paul A.
Asch Jeffrey
Douglas Alan P.
Smith Hugh E.
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