(under subclass 494) Subject matter in which means are provided for varying or changing the effective length of the armature or primary winding of an electric motor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
501, for this subject matter where the effective length is varied by short-circuiting part of the winding.
531, and the subclasses specified in the Notes thereto, for motor systems having variable length field windings.
SEE OR SEARCH CLASS
322, Electricity: Single Generator Systems,
93, for generator systems having a tapped or sectionalized armature winding.
