Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
2000-02-07
2000-11-21
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D04341589
REFERENCES:
patent: D409765 (1999-05-01), Armstrong et al.
patent: 3899045 (1975-08-01), Geisel et al.
patent: 5465809 (1995-11-01), Panicci
Armstrong Donald R.
Bolf Phillip F.
Clark Doris
Grundstrom Richard J.
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