Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1975-11-28
1977-03-29
Douglas, Alan P.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
D2502
Patent
active
D02438542
REFERENCES:
patent: D233750 (1974-11-01), Bryan
patent: 420143 (1890-01-01), Colbert
patent: 740460 (1903-10-01), Naylor
patent: 2622658 (1952-12-01), Morgan
Douglas Alan P.
West Robert G.
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