Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1997-10-15
1999-10-19
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
2504
Patent
active
D04155750
REFERENCES:
patent: D219067 (1970-10-01), Johnson
patent: D365156 (1995-12-01), Strickler
patent: 5515941 (1996-05-01), Palmer et al.
Clark Doris
Reechcraft, Inc.
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