Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1998-11-05
1999-09-14
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D04139909
REFERENCES:
patent: D395522 (1998-06-01), Roberts
patent: 3998416 (1976-12-01), Benolkin
patent: 4730802 (1988-03-01), Chatham et al.
patent: 4979590 (1990-12-01), Bailey
patent: 5370263 (1994-12-01), Brown
Bartnicki Frederick J.
Bell Randall
Dylik John J.
Hand James
Heald Edward E.
Bell Michael J.
Clark Doris
Milch Erik B.
Werner Co.
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