US PATENT SUBCLASS 73 / 647
.~.~.~.~ Current generating or modifying

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.~.~.~.~ Current generating or modifying {1}
648  DF  .~.~.~.~.~> Frequency sensitive

DEFINITION

Classification: 73/647

Current generating or modifying:

(under subclass 646) Subject matter including electrical means which gives or uses an electrical signal which varies as a function of at least one of the acoustical characteristics.

SEE OR SEARCH THIS CLASS, SUBCLASS:

649+, for subject matter comprising means for indicating or recording mechanical vibrations or analysis thereof.