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1998-05-06
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1998-06-15
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2000-09-28
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1995-10-12
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1996-08-04
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1996-05-23
Global sound microphone system
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1995-05-23
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1996-11-29
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1996-07-23
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1997-04-09
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2001-08-29
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1997-07-03
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1998-09-21
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2000-04-19
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1999-05-05
Microphone amplifier
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2000-03-22
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1995-04-18
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1999-05-15
Anti-vibration structure of a speaker
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1995-12-19
Tone signal generator having a sound effect function
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1995-09-07
Combined speaker and microphone unit
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1998-01-07
Selective calling receiver capable of providing a message by a speech sound