Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1988-10-24
1991-03-26
Zarfas, Louis S.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
D 2229, D 3 48, D 3105
Patent
active
D03157970
REFERENCES:
patent: D178990 (1956-10-01), Erickson
patent: D292347 (1987-10-01), Scott-Smith
patent: D306520 (1990-03-01), McCarthy
patent: 1291914 (1919-01-01), Kelley
patent: 4796790 (1989-01-01), Hamilton
Olisar/Cagle Corporation
Pandozzi M.
Smith Robert C.
Zarfas Louis S,.
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