Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1997-08-21
1999-04-20
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D04085566
REFERENCES:
patent: D366319 (1996-01-01), Sheftel
patent: 4880079 (1989-11-01), Leclerc
patent: 4974699 (1990-12-01), Boring
patent: 5484036 (1996-01-01), Cothern
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