Title:
Exhibition apparatus
United States Patent 2215396

Inventors:
Hoyt, Ebenezer W. W.
Publication Date:
09/17/1940
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Assignee:
Hoyt, Ebenezer W. W.
Primary Class:
359/866
Other Classes:
40/219
International Classes:
G02B27/22; G09F19/00; G09F27/00