US PATENT SUBCLASS 381 / 75
MEGAPHONES

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

75MEGAPHONES

DEFINITION

Classification: 381/75

MEGAPHONES:

(under the class definition) Subject matter for amplifying the human voice and which is capable of being carried.

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74, for headphone circuits.

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181, Acoustics,

177+, for sound intensifying horns.