US PATENT SUBCLASS 178 / 99.1-- .~.~ Private (e.g., acoustically shielded)

US PATENT SUBCLASS 178 / 99.1
.~.~ Private (e.g., acoustically shielded)

Current as of: June, 1999
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178 /	HD	TELEGRAPHY

118	DF	RECEIVERS {4}
98	DF	.~ Sounders {2}
99.1		.~.~ Private (e.g., acoustically shielded)

DEFINITION

Classification: 178/99.1

Private (e.g., acoustically shielded):

(under subclass 98) Subject matter which restricts the sounds produced to the recipient of the signal.

(1) Note. The sound restriction is generally produced by a sound blocking device.

SEE OR SEARCH CLASS

181, Acoustics, appropriate subclasses for a sound blocking device.

340, Communications: Electrical,

384.1+, for an electrical signalling sound producer.

381, Electrical Audio Signal Processing Systems and Devices,

339, for an acoustic reproducing transducer with a sound attenuating element.