Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1986-12-18
1998-12-01
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D04020456
REFERENCES:
patent: D268796 (1983-05-01), Kola
patent: D297789 (1988-09-01), Stepien
patent: D309680 (1990-08-01), Gutsy
patent: 4244064 (1981-01-01), Parr
Clark Doris
Lewis Charlotte
Long Randall
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