Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1997-09-30
2000-09-05
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
2504
Patent
active
D04306791
REFERENCES:
patent: D181560 (1957-11-01), Varnada, Sr.
patent: D270567 (1983-09-01), Conlin
patent: D351739 (1994-10-01), Cannon
patent: D372985 (1996-08-01), Bourgault
patent: 4912785 (1990-04-01), Inman
Clark Doris
Jeremiah Rodgers
LandOfFree
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