Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1989-05-02
1991-12-17
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03224856
REFERENCES:
patent: 2035537 (1936-03-01), Cowan et al.
patent: 3664458 (1972-05-01), Sterns et al.
patent: 3710894 (1973-01-01), O'Dell
patent: 4579198 (1986-04-01), Lee
patent: 4582165 (1986-04-01), Latini
Clark Doris
Word A. Hugo
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