Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1991-06-03
1994-02-22
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
Patent
active
D03445941
REFERENCES:
patent: D258148 (1981-02-01), Loix
patent: 1555483 (1925-09-01), Rosenberg
patent: 1805829 (1931-05-01), Marschke
patent: 2163142 (1939-06-01), Frazier
Bender S. Michael
Clark Doris
Word A. Hugo
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