Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1998-10-13
1999-11-23
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D04170113
REFERENCES:
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patent: 1005032 (1911-10-01), Hennessee
patent: 2810504 (1957-10-01), Pela
patent: 3302749 (1967-02-01), Heaphy
patent: 4411335 (1983-10-01), Forrester
patent: 4552246 (1985-11-01), Thomas
patent: 5040635 (1991-08-01), Strickland
Woller Ronald R.
Woller, Sr. John A.
Clark Doris
Summit Specialties, Inc.
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