Title:
Collapsible portable projection screen
Document Type and Number:
United States Patent 3324928
Inventors:
Hermann, Muller
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Publication Date:
06/13/1967
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Referenced by:
Export Citation:
Assignee:
AGFA AG
Primary Class:
Other Classes:
248/171
International Classes:
G03B21/58; G03B21/56
US Patent References:
Foreign References:
| AT220851B |