US PATENT SUBCLASS 356 / 139
.~ Plural scales or different portions of same scale simultaneously observable

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356 /   HD   OPTICS: MEASURING AND TESTING

138  DF  ANGLE MEASURING OR ANGULAR AXIAL ALIGNMENT {11}
139.~ Plural scales or different portions of same scale simultaneously observable

DEFINITION

Classification: 356/139

(under subclass 138) Subject matter including means whereby two different angle measuring scales or two different portions of the same angle measuring scale are simultaneously observable.