Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1999-12-20
2000-08-29
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
2504
Patent
active
D04303075
REFERENCES:
patent: D312314 (1990-11-01), Harris
patent: 3662656 (1972-05-01), Finsterwalder et al.
patent: 3979787 (1976-09-01), Ahlgren
Pekin Orhan
Sarikcioglu Cengiz
Clark Doris
Morkunas Frank G.
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