Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1995-05-26
1996-08-20
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03729907
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patent: D340291 (1993-10-01), Bartnicki et al.
patent: 4222541 (1980-09-01), Cillis
patent: 4437544 (1984-03-01), Anderson et al.
patent: 4862994 (1989-09-01), Hughes, Sr.
patent: 5058707 (1991-10-01), Waid
patent: 5120013 (1992-06-01), Sweeney
patent: 5191954 (1993-03-01), Ledford
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