Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1992-05-28
1994-02-01
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03439070
REFERENCES:
patent: 169389 (1875-11-01), Waring
patent: D309026 (1992-07-01), Harvey et al.
patent: 1352323 (1920-09-01), Stephan
patent: 1909565 (1933-05-01), Babitt
patent: 4836331 (1989-06-01), Foradori
Bender S. Michael
Clark Doris
Word A. Hugo
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