Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1976-06-01
1978-08-01
Burke, Wallace R.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
D0699
Patent
active
D02487772
REFERENCES:
patent: 1920552 (1933-08-01), Dollerhide
patent: 2500559 (1950-03-01), Miller
patent: 2801886 (1957-08-01), Peterson
patent: 2871067 (1959-01-01), Brogdon
patent: 3511338 (1970-05-01), Chapman
Spencer Edward
Wing Harold R.
Burke Wallace R.
Gandy James M.
Little Giant Industries Inc.
Workman H. Ross
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