(under subclass 138) Subject matter including apparatus to attach to a wheel or wheels to determine and indicate relative angular direction of their planes of rotation by using photodetection.
SEE OR SEARCH THIS CLASS, SUBCLASS:
150, for alignment of a wheel running axis which is transverse to the angle of the measuring axis.
153, for wheel alignment of subclass 138 without photodetection.
SEE OR SEARCH CLASS
33, Geometrical Instruments,
203+, and 288 for wheel alignment that does not claim optical detection.
250, Radiant Energy, 206.1+, for alternative outputs of measured coordinates that are not displayed, per se.
