Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1981-04-10
1983-10-11
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
D2599
Patent
active
D02709511
REFERENCES:
patent: 3460649 (1969-08-01), Baker et al.
patent: 3856111 (1974-12-01), Baker
patent: 4130180 (1978-12-01), Ferguson et al.
patent: 4137995 (1979-02-01), Fonte
patent: 4230296 (1980-10-01), Staley et al.
patent: 4316526 (1982-02-01), Amacker
patent: 4331216 (1982-05-01), Amacker
Phillips C. A.
Word A. Hugo
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