Title:
Disappearing stairway
Document Type and Number:
United States Patent 1344371

Inventors:
Badger, Thomas N.
Smith, William G.
Publication Date:
06/22/1920
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Referenced by:
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Assignee:
Badger, Thomas N.
Smith, William G.
Primary Class:
182/78
Other Classes:
182/176
International Classes:
E04F11/06; E04F11/02




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