Ladder step

Details Ladder step Ladder step

1992-07-15

1994-01-25

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

Patent

active

D03436926

REFERENCES:
patent: D225160 (1972-11-01), Thomas
patent: D238867 (1976-02-01), Howells
patent: D279607 (1985-07-01), Rutter
patent: 2899011 (1959-08-01), Babits
patent: 2991118 (1961-07-01), Sleger
patent: 3422923 (1969-01-01), Lund
patent: 3915475 (1975-10-01), Casella et al.
patent: 4569533 (1986-02-01), Gronert et al.

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