Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1998-03-20
1999-10-05
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D04148797
REFERENCES:
patent: D387878 (1997-12-01), Jacques
patent: 1283212 (1918-10-01), Kloepfer
patent: 3269485 (1966-08-01), Larson
patent: 4494626 (1985-01-01), Ast
Clark Doris
R.M.M. Corp., Inc.
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