(under subclass 405) Subject matter having a plurality of vacuum tubes connected in the testing circuit during the testing operation.
SEE OR SEARCH CLASS
315, Electric Lamp and Discharge Devices: Systems,
130, for miscellaneous plural load device systems having means to indicate a condition affecting the operation of one or more of the lamps and/or discharge devices; and subclasses 312+ and the subclasses specified in the notes to the definitions of these subclasses for miscellaneous systems for supplying electric energy to a plurality of lamps and/or discharge devices.
