Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1991-10-21
1992-09-08
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03292959
REFERENCES:
patent: 524270 (1894-08-01), Wimbush
patent: 532983 (1895-01-01), Myero
patent: 1231318 (1917-06-01), Wine
patent: 2202597 (1940-05-01), Myerstuen
patent: 2607523 (1952-08-01), Williams et al.
patent: 2897013 (1959-07-01), Delp
patent: 2999290 (1961-09-01), Giles
patent: 3715012 (1973-02-01), Perry
Waco Scaffolding and Shoring Equipment Catalog dated Aug. 1961, p. 10, Horizontal Brace bottom right of page.
Clark Doris
Word A. Hugo
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