Patent classifications
G
PHYSICS
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G03
PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
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G03G
ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
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15/00
Apparatus for electrographic processes using a charge pattern
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G03G15/22
involving the combination of more than one step according to groups G03G13/02 - G03G13/20
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G03G15/23
specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
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G03G15/231
Arrangements for copying on both sides of a recording or image-receiving material
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