Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1997-11-26
1999-07-06
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D04118880
REFERENCES:
patent: D288719 (1987-03-01), Feist
patent: 4440264 (1984-04-01), Knoke et al.
Cosco 1995 Home Furnishings Catalog, pp. 2-5.
Clark Doris
Cosco, Inc.
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