Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1998-06-15
2000-09-26
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D04313038
REFERENCES:
patent: 3236012 (1966-02-01), Laven
patent: 4599835 (1986-07-01), Rinke
patent: 5186874 (1993-02-01), McLaughlin
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