Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1993-12-16
1995-03-07
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
Patent
active
D03561640
REFERENCES:
patent: D244093 (1977-04-01), Gamon
patent: 2798652 (1957-07-01), Easton
patent: 3023832 (1962-03-01), Silverman
patent: 3698511 (1972-10-01), Dohan
patent: 4418792 (1983-12-01), Cerone
patent: 4823529 (1989-04-01), Canfield et al.
Clark Doris
Lingbeck David A.
LandOfFree
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