Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1988-09-01
1990-03-06
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Patent
active
D03064883
REFERENCES:
patent: 1257056 (1918-02-01), Wheatley
patent: 1953390 (1934-04-01), Bosch
patent: 2419145 (1947-04-01), Kersenbrock et al.
patent: 4667773 (1987-05-01), Davis
Burdick Glen M.
Clark Doris
Word A. Hugo
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