Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1999-06-29
2000-05-16
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D0425211&
REFERENCES:
patent: D324272 (1992-02-01), Thiel
patent: 3422923 (1969-01-01), Lund
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