Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1998-12-04
1999-09-28
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
2504
Patent
active
D04145658
REFERENCES:
patent: D373427 (1996-09-01), Russom
patent: 4723630 (1988-02-01), Wolford et al.
Bush Kenneth M.
Clark Doris
Veal Robert J.
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