Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1996-05-07
1997-12-30
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D03885208
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Hoffman, deceased Leland J.
Stocking, executor L. A.
Clark Doris
Hercules Products, Inc.
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