US PATENT SUBCLASS 968 / 748
MEASURING, COUNTING, CALIBRATING, TESTING, OR REGULATING APPARATUS (measuring devices and calibers in general G01B; counters in general H03K) [G04D 7/00]


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968 /   HD   HOROLOGY

748MEASURING, COUNTING, CALIBRATING, TESTING, OR REGULATING APPARATUS (measuring devices and calibers in general G01B; counters in general H03K) [G04D 7/00] {11}
749  DD  .~> Purely mechanical measuring and testing apparatus [G04D 7/00B]
750  DD  .~> Electrical measuring and testing apparatus [G04D 7/00C] {1}
752  DD  .~> Optical measuring and testing apparatus [G04D 7/00D]
753  DD  .~> Counters for small components, e.g., bearing jewels, etc. [G04D 7/00G]
754  DD  .~> Testing apparatus for complete clockworks with regard to external influences or general good working [G04D 7/00K] {3}
758  DD  .~> For mainsprings [G04D 7/02]
759  DD  .~> For gearwork, e.g., optical control of gear wheels, etc. (optical control in general G01B, G01B 9/08) [G04D 7/04]
760  DD  .~> For escapements [G04D 7/06]
761  DD  .~> For balance wheels [G04D 7/08] {2}
768  DD  .~> For hairsprings of balances [G04D 7/10]
769  DD  .~> Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard (supporting devices for clocks with built-in recording apparatus subclass 681; measuring short time intervals subclass 844; frequency measuring in general H04B, G01R) [G04D 7/12] {2}