Building units and construction elements – Stair – ladder – scaffold – or similar support – Scaffold
Patent
1990-08-21
1993-11-02
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Scaffold
Patent
active
D03409953
REFERENCES:
patent: 403636 (1889-05-01), Bitterly
patent: 494358 (1893-03-01), Weeks
patent: 1725168 (1929-08-01), Willis
patent: 4207966 (1980-06-01), Aubin et al.
patent: 4226301 (1980-10-01), McDaniel
patent: 4640385 (1987-02-01), Underhill
patent: 4823913 (1989-04-01), Riegel
Clark Doris
Gernstein Terry M.
Word A. Hugo
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