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United States Patent 1652907

Inventors:
Robert, Nelson Arvid
Burgess, Joseph E.
Publication Date:
12/13/1927
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Assignee:
Robert, Nelson Arvid
Burgess, Joseph E.
Primary Class:
40/666
Other Classes:
40/308, 211/73, 40/307
International Classes:
G09F1/04; G09F1/00