CATHODE RAY TUBE SYSTEM FOR PRODUCING HALF-TONE IMAGES
United States Patent 3549939
Inventors:
Smitzer, Louis A.
Publication Date:
12/22/1970
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Assignee:
STROMBERG DATAGRAPHIX INC
Primary Class:
Other Classes:
345/695, 313/436, 347/251, 347/226, 315/365
International Classes:
B41B19/01; G09G1/22; H01J31/16; B41B19/00; H01J29/76