Title:
Disappearing stairway
Document Type and Number:
United States Patent 1867904

Inventors:
Bessler, Frank E.
Publication Date:
07/19/1932
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Assignee:
Bessler, Disappearing Stairway
Primary Class:
182/78
Other Classes:
182/106, 182/156
International Classes:
E04F11/06; E04F11/02




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