Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1988-12-22
1990-05-08
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
D 6350
Patent
active
D03078000
REFERENCES:
patent: D194399 (1963-01-01), Muth et al.
patent: D198679 (1964-07-01), Cartner
patent: D271256 (1983-11-01), McClelland
patent: 3743051 (1973-07-01), Cramer
Clark Doris
O'Planick Richard B.
Rubbermaid Incorporated
Word A. Hugo
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