Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1996-08-15
1998-01-27
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D03899233
REFERENCES:
patent: D265251 (1982-06-01), Darby et al.
patent: 5065840 (1991-11-01), Cadigan
Hillman Jeffrey M.
Vierus Clifton D.
Clark Doris
E-Z Dock, Inc.
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