Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1997-08-19
1999-04-20
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D04085558
REFERENCES:
patent: D337211 (1993-07-01), Bergkuist
patent: D353636 (1994-12-01), LeRoux
patent: 5354247 (1994-10-01), Wikenson
Clark Doris
Fibergrate Composite Structures Incorporated
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