Method of and apparatus for operating intelligence systems
United States Patent 2039406

Inventors:
Greensfelder, Elmer L.
Publication Date:
05/05/1936
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Assignee:
Greensfelder, Elmer L.
Primary Class:
358/401
Other Classes:
235/470, 400/109.100, 358/451, 369/258.100, 358/303, 178/17D, 434/114, 369/223, 348/62, 382/114, 358/497, 358/474
International Classes:
B41J3/32; B41J3/00