Electron photography
United States Patent 2221776

Inventors:
Carlson, Chester F.
Publication Date:
11/19/1940
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Assignee:
Carlson, Chester F.
Primary Class:
430/48
Other Classes:
156/238, 430/123.200, 399/290, 347/121, 250/475.200, 347/139, 118/309, 156/241, 101/DIG.037
International Classes:
G03G9/08; G03G15/26; G03G15/00