Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1989-12-06
1991-12-03
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03221342
REFERENCES:
patent: 3266593 (1966-08-01), Okie et al.
patent: 3620027 (1968-04-01), Nordell
patent: 4161232 (1979-07-01), Boston
patent: 4948300 (1990-08-01), Bateson
Clark Doris
Ronningen Research & Development Company
Word A. Hugo
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