Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1993-09-07
1995-06-06
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
Patent
active
D03591344
REFERENCES:
patent: D275798 (1984-10-01), Ruda et al.
patent: 4431082 (1984-02-01), Bott
patent: 5024292 (1991-06-01), Gilbreath et al.
Clark Doris
Sembrat Kevin A.
Volk David L.
LandOfFree
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