Title:
Folding stairs
Document Type and Number:
United States Patent 2572281
Inventors:
Pierce, Ernest E.
Plaque It!
Sponsored by: Flash of Genius |
Publication Date:
10/23/1951
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Referenced by:
Export Citation:
Assignee:
Pierce, Ernest E.
Primary Class:
Other Classes:
182/106
International Classes:
E04F11/06; E04F11/02
US Patent References:
| 2314004 | Folding stairway |