US PATENT SUBCLASS 73 / 648
.~.~.~.~.~ Frequency sensitive

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

570  DF  VIBRATION {10}
584  DF  .~ By mechanical waves {13}
645  DF  .~.~ Acoustic parameter {1}
646  DF  .~.~.~ Amplitude, power, or intensity {1}
647  DF  .~.~.~.~ Current generating or modifying {1}
648.~.~.~.~.~ Frequency sensitive

DEFINITION

Classification: 73/648

Frequency sensitive:

(under subclass 647) Subject matter wherein the current generating or modifying means produces a variable frequency signal as a function of the power, amplitude, etc., of the sonic waves.

SEE OR SEARCH THIS CLASS, SUBCLASS:

645, for determining the frequency of sonic waves not included in this subclass 648.