Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1997-05-30
1998-03-24
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D03927474
REFERENCES:
patent: 2734205 (1956-02-01), Preiss
patent: 5062607 (1991-11-01), Kisner
patent: 5154383 (1992-10-01), Collinson
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