Folding stair unit

Details Folding stair unit Folding stair unit

1988-05-12

1989-11-07

Burke, Wallace R.

Building units and construction elements

Stair, ladder, scaffold, or similar support

Patent

active

D03044998

REFERENCES:
patent: D179311 (1956-11-01), Marcy
patent: D229921 (1974-01-01), De Luca
patent: 3207260 (1965-09-01), Castagna
patent: 3747708 (1973-07-01), Wenger et al.
patent: 4006564 (1977-02-01), Wiese
patent: 4276955 (1981-07-01), Hickman
patent: 4412403 (1983-11-01), Le Franc et al.

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