Ladder leveling attachment

Details Ladder leveling attachment Ladder leveling attachment

1989-01-31

1991-04-30

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

Patent

active

D03166082

REFERENCES:
patent: 2371460 (1945-03-01), Needham
patent: 2559856 (1951-07-01), Edhlund
patent: 4423797 (1984-01-01), Batten
patent: 4554994 (1985-11-01), Weirer
patent: 4723629 (1988-02-01), van den Hoek et al.

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