Title:
Disappearing stairway
United States Patent 2582622


Inventors:
Craig, John R.
Application Number:
US8827349A
Publication Date:
01/15/1952
Filing Date:
04/19/1949
Assignee:
Craig, John R.
Primary Class:
Other Classes:
49/37, 49/386
International Classes:
E04F11/06
View Patent Images:
US Patent References:
2163142Concealable stair1939-06-20
1805829Collapsible concealing ladder1931-05-19
0597457N/A1898-01-18
0481798N/A1892-08-30
0422678N/A1890-03-04