Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1978-07-13
1982-10-19
Gandy, James M.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
D2502
Patent
active
D02665930
REFERENCES:
patent: 1091798 (1914-03-01), Booraem et al.
patent: 1760200 (1930-05-01), Large
patent: 1916252 (1933-07-01), Boardman
patent: 2580326 (1951-12-01), Stevens
patent: 3971456 (1976-07-01), Yonce
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