Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1996-11-08
1998-01-20
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D03895882
REFERENCES:
patent: 195504 (1877-09-01), Gustafson
patent: D195504 (1963-06-01), Waite
patent: 4285177 (1981-08-01), Seegers
"Mebec Nosings and Stair Treads" by IKG Borden Published in Old Bridge, CT, USA on May 23, 1991.
Clark Doris
Harsco Corporation
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