Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1997-03-13
1999-03-16
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D04069064
REFERENCES:
patent: D324130 (1992-02-01), Matsumoto et al.
patent: D351030 (1994-09-01), Laughlin et al.
patent: 4620610 (1986-11-01), Southard
Clark Doris
Nihon Gaishi Seisen Kogyo Co., Ltd.
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