Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1998-10-13
2000-02-01
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D04201477
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Woller Ronald R.
Woller, Sr. John A.
Clark Doris
Gardner Arthur A.
Summit Specialties, Inc.
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