4. Electrical audio signal processing systems and devices
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Acoustic antenna for computer workstation

Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent

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Acoustic apparatus

Electrical audio signal processing systems and devices – Including frequency control
Patent

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Acoustic apparatus

Electrical audio signal processing systems and devices – Loudspeaker feedback
Patent

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Acoustic apparatus

Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices – Testing of hearing aids
Reexamination Certificate

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Acoustic apparatus

Electrical audio signal processing systems and devices – Binaural and stereophonic – Hearing aid
Patent

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Acoustic apparatus

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer
Patent

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Acoustic apparatus

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer
Patent

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Acoustic apparatus

Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent

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Acoustic apparatus

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate

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Acoustic apparatus and acoustic setting method

Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo speaker arrangement
Reexamination Certificate

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Acoustic apparatus and driving apparatus constituting the same

Electrical audio signal processing systems and devices – Loudspeaker feedback
Patent

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Acoustic apparatus and headphone

Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate

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Acoustic apparatus and method

Electrical audio signal processing systems and devices – Binaural and stereophonic – Hearing aid
Patent

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Acoustic apparatus and method of controlling an acoustic...

Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Reexamination Certificate

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Acoustic apparatus and telephone conversation apparatus

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate

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Acoustic apparatus having balance adjustment

Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Reexamination Certificate

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Acoustic apparatus wearable on the head

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Reexamination Certificate

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Acoustic apparatus with secondary quarterwave resonator

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer
Patent

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Acoustic apparatus, connection polarity determination...

Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices
Reexamination Certificate

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Acoustic assembly for a transducer

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate

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