(under subclass 218) Subject matter in which a trolley or plow, its wheel, or some member attached to the trolley makes a temporary electrical contact with one or more contact-surfaces.
SEE OR SEARCH THIS CLASS, SUBCLASS:
31, 72, 77+, 81, 85, 92, 229, 233, and 234, for trolley-completed-circuit systems.
SEE OR SEARCH CLASS
40, Card, Picture, or Sign Exhibiting,
463+, for incidental disclosure of trolley-contacts.
