Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1999-04-30
2000-12-12
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D04351177
REFERENCES:
patent: 3213570 (1965-10-01), Abramson, Jr.
patent: 4126354 (1978-11-01), DeLong et al.
patent: 4631874 (1986-12-01), Griffin, Jr.
Johnsson Bo
Johnsson Lars I.
Johnsson Par J.
Clark Doris
Sit Down Export AB
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