Ceiling-suspended stair
United States Patent 2580978
US Patent References:
/0050894.html
- - 0050894

/0121190.html
- - 0121190

Sliding stairway
- - 1737799

Disappearing stairway
- - 1936929


Inventors:
Triller, Benjamin J.
Publication Date:
01/01/1952
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Assignee:
FARLEY & LOETSCHER MFG COMPANY
Primary Class:
182/80
International Classes:
E04F11/04; E04F11/02