发明授权
US3978786A Copy and reusable master making system apparatus for preparing a permanent image 失效
用于准备永久性图像的复制和可重复使用的主制造系统装置

Copy and reusable master making system apparatus for preparing a
permanent image
摘要:
An apparatus used in the formation of visible copies of an image, the establishment of an electric field embracing a screen laden with toner material and a platen supporting a receiving sheet, and spraying ions in an image formation upon the toner on the screen in a sign which will cause the resultant toner particles to be impelled by the field upon the sheet.
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