Plural heads

Subclass of:

347 - Incremental printing of symbolic information

347111000 - ELECTRIC MARKING APPARATUS OR PROCESSES

347112000 - Electrostatic

347115000 - Multicolor

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application number	Description	Number of patent applications / Date published
347118000	Using light as exposure means	232