Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1994-08-26
1998-01-06
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
2504
Patent
active
D03888835
REFERENCES:
patent: D340773 (1993-10-01), Bartnicki et al.
patent: 5342008 (1994-08-01), Kay
Crooks William K.
Thivierge Gary R.
Clark Doris
Day Sharon L.
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