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Class Information
Number:
381/
Name:
Electrical audio signal processing systems and devices
> Binaural and stereophonic
Description:
Sub-classes under this class:
Class Number
Class Name
Patents
381/28
Amplifier
119
381/2
Broadcast or multiplex stereo
286
381/27
Center channel
147
381/23.1
Hearing aid
121
381/17
Pseudo stereophonic
696
381/19
Quadrasonic
182
381/26
Stereo sound pickup device (microphone)
146
381/300
Stereo speaker arrangement
262
Patents under this class:
Patent Number
Title Of Patent
Date Issued
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