Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1997-09-11
1999-01-12
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
2503
Patent
active
D04041437
REFERENCES:
patent: D375388 (1996-11-01), Tsugita
patent: 4972540 (1990-11-01), Phelps
patent: 5213060 (1993-05-01), Sloan et al.
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