Stepladder

Details Stepladder Stepladder

1991-11-25

1993-11-30

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

Stepped

Patent

active

D03418952

REFERENCES:
patent: D179892 (1957-03-01), Gastright
patent: 190027 (1877-04-01), Gollette
patent: D238607 (1976-01-01), Gannon
patent: 336219 (1886-02-01), Dormitzer
patent: 2896830 (1959-07-01), Bair
patent: 2909236 (1959-10-01), Rabelos
patent: 3005513 (1961-10-01), Larson
patent: 3299985 (1967-01-01), Harrison
patent: 4089084 (1978-05-01), Droz
patent: 4311209 (1982-01-01), Primerano et al.
patent: 4718518 (1988-01-01), Brown

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