Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1976-06-09
1978-01-03
Burke, Wallace R.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
D2599
Patent
active
D02468590
REFERENCES:
patent: 2469593 (1949-05-01), Coble
patent: 2488984 (1949-11-01), Pennington
patent: 2541343 (1951-02-01), Dakin
patent: 2936989 (1960-05-01), Siek
Burke Wallace R.
Gandy James M.
Schroeder Everett J.
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