Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1992-11-23
1994-07-19
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03489388
REFERENCES:
patent: D305567 (1990-01-01), Scott
patent: D309026 (1990-07-01), Harvey et al.
patent: D316608 (1991-04-01), Wagner
patent: 4306632 (1981-12-01), Brown
patent: 4363378 (1982-12-01), Williams et al.
patent: 4591023 (1986-05-01), Hodson
patent: 4798263 (1989-01-01), Harvey et al.
patent: 4949810 (1990-08-01), Dwinnell
patent: 5010979 (1991-04-01), Shreve, III
Clark Doris
Doherty Robert J.
Word A. Hugo
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