Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1997-01-24
1999-01-19
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D04045025
REFERENCES:
patent: 5419409 (1995-05-01), Corulla
Clark Doris
Keller Ladders, Inc.
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