Building units and construction elements – Stair – ladder – scaffold – or similar support – Scaffold
Patent
1989-02-21
1991-03-26
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Scaffold
Patent
active
D03157962
REFERENCES:
patent: 1004689 (1911-10-01), Raymer
patent: 1503305 (1924-07-01), Dolaro
patent: 1945113 (1934-01-01), Klobovcnik
patent: 2043864 (1936-06-01), Novak
patent: 4320816 (1982-03-01), Callahan et al.
Caldwell Richard L.
Smith Larry W.
Clark Doris
Word A. Hugo
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