Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1977-08-29
1979-09-18
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
D25 1, D25 61, D25 66, D2599
Patent
active
D02529505
REFERENCES:
patent: 2188077 (1940-01-01), Dowd
patent: 3335573 (1967-08-01), Ward
patent: 4056940 (1977-11-01), Fisher
patent: 4114383 (1978-09-01), Nieber
AGL Corporation
Carver Stephen D.
Word A. Hugo
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