by contact, friction or induction

Full Title

Apparatus for electrophotographic processes > Arrangements for laying down a uniform charge > by contact, friction or induction

Of 3 combined children, 0 exist in both systems.

3 codes are CPC-only extensions.

Note: 3 CPC extensions are marked as secondary classification only.

This code exists only in CPC.

Diff view requires codes present in both systems.