Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1995-01-13
1998-05-26
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D03947157
REFERENCES:
patent: 51205 (1865-11-01), McMaster
patent: D180122 (1957-04-01), Turnstead
patent: 186424 (1877-01-01), Jones
patent: D203173 (1965-12-01), Chubbs
patent: 238067 (1881-02-01), Teed
patent: 889395 (1908-06-01), Noyes
patent: 1952878 (1934-03-01), Marshutz
patent: 4069892 (1978-01-01), Lynne et al.
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