Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1997-03-05
1998-12-01
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D04020464
REFERENCES:
patent: D335354 (1993-05-01), Phillips
patent: D364930 (1995-12-01), Burge et al.
patent: 3856109 (1974-12-01), Gates
patent: 5282339 (1994-02-01), Devlin et al.
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