Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1998-12-29
1999-12-14
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D04177363
REFERENCES:
patent: D281106 (1985-10-01), Thomas et al.
patent: D322134 (1991-12-01), Eickhoff
patent: 3888058 (1975-06-01), Ahrens
patent: 5553421 (1996-09-01), Stratford
Clark Doris
Isaf Louis T.
LandOfFree
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