Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1991-02-07
1993-04-13
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03348130
REFERENCES:
patent: D153900 (1949-05-01), Regan
patent: D265592 (1982-07-01), Perkins
patent: D303432 (1989-09-01), Pestone
patent: 2281684 (1942-05-01), Fijux
patent: 2518107 (1950-08-01), Wilson
patent: 2925877 (1960-02-01), Wright
patent: 3662856 (1972-05-01), D'Amico et al.
patent: 4469194 (1984-09-01), McBride
patent: 4771862 (1988-09-01), Garland
patent: 4880079 (1989-11-01), Leclerc
patent: 4899848 (1990-02-01), Parr
Clark Doris
Crawford Products, Inc.
Word A. Hugo
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