Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1991-09-23
1993-11-09
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03412148
REFERENCES:
patent: D257395 (1980-10-01), Correll
patent: D279606 (1985-07-01), Merians
patent: D325639 (1992-04-01), Tavella
patent: 3212606 (1965-10-01), Span
patent: 3276545 (1966-10-01), D'Angelo
patent: 4298096 (1981-11-01), Prior
patent: 4565263 (1986-01-01), Southworth
BL Manufacturing, Inc.
Clark Doris
Word A. Hugo
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