US PATENT SUBCLASS 96 / 419
.~ Sound signal

Current as of: June, 1999
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96 /   HD   GAS SEPARATION: APPARATUS

417  DF  WITH SIGNALS, INDICATORS, MEASURING, OR TESTING MEANS {6}
419.~ Sound signal

DEFINITION

Classification: 96/419

Sound signal:

(under subclass 417) Apparatus in which the information giving means is a device that generates a vibratory disturbance in the pressure and density of a fluid that may be perceived by the unaided human ear.