Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1989-12-06
1991-12-03
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Patent
active
D03221326
REFERENCES:
patent: D191830 (1961-11-01), Rude
patent: 2687617 (1954-08-01), Newell
patent: 2759331 (1956-08-01), Fiebinger et al.
patent: 2925921 (1960-02-01), DePew et al.
patent: 4349297 (1982-09-01), Misener
Clark Doris
Ronningen Research & Development Company
Word A. Hugo
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