Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1980-07-24
1982-06-29
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
D25 63, D2502
Patent
active
D02652510
REFERENCES:
patent: D233750 (1974-11-01), Bryan
patent: 1193862 (1916-08-01), Booraem
patent: 3975874 (1976-08-01), Witte et al.
Sweet's Architectural Catalog File, 1978, 13.22/Wh, p. 7, step assemblies at lower left.
Darby David L.
Darby James W.
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