Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1993-11-29
1995-10-31
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
D25 52
Patent
active
D03637840
REFERENCES:
patent: D242925 (1977-01-01), Salter
patent: D350208 (1994-08-01), Zajac
patent: 4705141 (1987-11-01), Splaine
patent: 5018600 (1991-05-01), Sobczak
patent: 5022491 (1991-06-01), Gill
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