Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1999-07-12
2000-05-09
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D0424706&
REFERENCES:
patent: D389923 (1998-01-01), Hillman et al.
patent: 5333323 (1994-08-01), Aymes
Clark Doris
Waterair Industries
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