Wall jack

Details Wall jack Wall jack

1988-07-07

1991-01-15

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

Patent

active

D03138534

REFERENCES:
patent: D260832 (1981-09-01), Verdesca et al.
patent: 685984 (1901-11-01), Heiden
patent: 811514 (1906-01-01), Mills
patent: 894295 (1908-07-01), Stoops
patent: 966852 (1910-08-01), Norton
patent: 980240 (1911-01-01), Fry
patent: 1468412 (1922-02-01), Peters
patent: 1779782 (1930-10-01), Steinman
patent: 3164353 (1965-01-01), Rene
patent: 4542874 (1985-09-01), Ronning

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