Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1995-01-17
1996-08-20
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03729885
REFERENCES:
patent: D222894 (1972-01-01), Taylor
patent: 462686 (1891-11-01), Brazeer
patent: 651444 (1900-06-01), Nelson
patent: 5101932 (1992-04-01), Trudgeon
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