Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1999-11-15
2000-09-19
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D04310810
REFERENCES:
patent: D422091 (2000-03-01), Michelsen
patent: 3080601 (1963-03-01), Kramcsak, Jr.
patent: 4846305 (1989-07-01), Kupfert
patent: 5791435 (1998-08-01), Garnett
Gustavsson Ove
Johansson Kjell
AB Forserums Verktygsindustri
Clark Doris
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