Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1989-12-06
1992-05-12
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03261590
REFERENCES:
patent: 330963 (1885-11-01), Dennis
patent: 3130814 (1964-04-01), Aquila
patent: 3826336 (1974-07-01), Cramer
patent: 4034829 (1977-07-01), Hoffman
patent: 4753320 (1988-06-01), Walter
Clark Doris
Ronningen Research & Development Company
Word A. Hugo
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