Step ladder having recessed steps

Details Step ladder having recessed steps Step ladder having recessed steps

1992-02-28

1994-02-01

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

Stepped

Patent

active

D03439062

REFERENCES:
patent: 600730 (1898-03-01), Lincoln
patent: 716149 (1902-12-01), Tratton
patent: 2010588 (1935-08-01), Gooden
patent: 2167157 (1939-07-01), Muehlberg
patent: 2467800 (1949-04-01), Backlin et al.
patent: 2857087 (1958-10-01), Pratt
patent: 2899008 (1959-08-01), Larson
patent: 3085651 (1963-04-01), Rich
patent: 3288247 (1966-11-01), Barnes
patent: 4125175 (1978-11-01), Ernst
patent: 4719990 (1988-01-01), Markovic

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