Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1999-05-13
2000-04-11
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D04227174
REFERENCES:
patent: 5673885 (1997-10-01), Pham
Bartnicki Frederick J.
Bell Randall
Dylik John J.
Hand James
Heald Edward E.
Bell Michael J.
Clark Doris
Werner Co.
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