Title:
Keystone eliminator for portable projection screens
Document Type and Number:
United States Patent 3205772
Inventors:
Guske, James A.
Plaque It!
Sponsored by: Flash of Genius |
Publication Date:
09/14/1965
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Referenced by:
Export Citation:
Assignee:
RADIANT MFG CORP
Primary Class:
Other Classes:
248/454, 248/477, 248/464, 248/246, 248/449
International Classes:
G03B21/58; G03B21/56
US Patent References:
Foreign References:
| GB729362A |