Method and apparatus for copying
United States Patent 3232190

Inventors:
Willmott, Robert W.
Publication Date:
02/01/1966
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Assignee:
IBM
Primary Class:
Other Classes:
430/102
International Classes:
G03G15/08
US Patent References:
2996400Positive and negative electroprinting
3013890Process of developing electrostatic images and composition therefor