US PATENT SUBCLASS 968 / 749
.~ Purely mechanical measuring and testing apparatus [G04D 7/00B]


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968 /   HD   HOROLOGY

748  DD  MEASURING, COUNTING, CALIBRATING, TESTING, OR REGULATING APPARATUS (measuring devices and calibers in general G01B; counters in general H03K) [G04D 7/00] {11}
749.~ Purely mechanical measuring and testing apparatus [G04D 7/00B]