US PATENT SUBCLASS 73 / 591
.~.~ Listening or sound tube

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

570  DF  VIBRATION {10}
584  DF  .~ By mechanical waves {13}
591.~.~ Listening or sound tube

DEFINITION

Classification: 73/591

Listening or sound tube:

(under subclass 584) Subject matter wherein a device for detecting the mechanical waves utilized a tube through which

one may listen.

SEE OR SEARCH THIS CLASS, SUBCLASS:

649+, for sensing or detecting apparatus.

SEE OR SEARCH CLASS

181, Acoustics,

131, for stethoscopes, per se.