Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1984-09-12
1987-03-10
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
Patent
active
D02887193
REFERENCES:
patent: D273919 (1984-05-01), Pasinski
patent: 3005513 (1961-10-01), Larson
patent: 3299985 (1967-01-01), Harrison
patent: 4231448 (1980-11-01), Jensen
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