Folding ladder

Details Folding ladder Folding ladder

1975-10-02

1977-01-04

Burke, Wallace R.

Building units and construction elements

Stair, ladder, scaffold, or similar support

Stepped

D0699

Patent

active

D02429250

REFERENCES:
patent: 311661 (1885-02-01), Joynt
patent: 1177557 (1916-03-01), White
patent: 1240653 (1917-09-01), Bell
patent: 1644739 (1927-10-01), McCracken
patent: 3061042 (1962-10-01), Giles

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