US PATENT SUBCLASS 324 / 727
.~ Piezoelectric crystal testing (e.g., frequency, resistance)

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324 /   HD   ELECTRICITY: MEASURING AND TESTING

600  DF  IMPEDANCE, ADMITTANCE OR OTHER QUANTITIES REPRESENTATIVE OF ELECTRICAL STIMULUS/RESPONSE RELATIONSHIPS {8}
727.~ Piezoelectric crystal testing (e.g., frequency, resistance)

DEFINITION

Classification: 324/727

Piezoelectric crystal testing (e.g., frequency, resistance):

(under subclass 600) Subject matter including means for determining the properties of piezoelectric crystals.

SEE OR SEARCH THIS CLASS, SUBCLASS:

78+, for the measurement of frequency.

SEE OR SEARCH CLASS

29, Metal Working,

25.33, for this subject matter in combination with manufacturing.

310, Electrical Generator or Motor Structure, 311+, for piezoelectric elements and devices, per se.