Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1982-06-28
1984-06-19
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D02743647
REFERENCES:
patent: 2930442 (1960-03-01), Carter
patent: 3182749 (1965-05-01), Girardello
patent: 4383669 (1983-05-01), Rasler
Brownlee Stepladder Extensions, Inc.
Word A. Hugo
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