Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1988-09-23
1990-11-20
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Patent
active
D03123146
REFERENCES:
patent: D213871 (1969-04-01), Sorenson
patent: 1624721 (1927-04-01), Doke
patent: 1766316 (1930-06-01), Vance
patent: 1839233 (1932-01-01), Leffert et al.
patent: 2009037 (1935-07-01), Willerig
patent: 2466982 (1949-04-01), Easterwood
patent: 2584066 (1952-01-01), Torkelson
B. J. Harris (Oxford) Limited of the Laboratories
Clark Doris
Word A. Hugo
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