(under the class definition) Roll which includes specific magnet or electromagnetic structure.
SEE OR SEARCH CLASS
355, Photocopying,
133, for a roll or roller especially adapted for use in contact printing.
399, Electrophotography,
279+, for development rollers, particularly subclass 282 for magnetic brush; subclass 313 for transfer rollers; subclasses 330+ for heat and pressure rollers providing fixing; subclass 356 for magnetic cleaning of imaging surface; subclass 357 for cleaning image surface by rollers; and subclasses 361+ for document handling.