Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1999-07-15
2000-05-16
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D04252098
REFERENCES:
patent: D300365 (1989-03-01), Wallick, Jr. et al.
patent: 3912043 (1975-10-01), Brannan
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