4. Electrical audio signal processing systems and devices
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Two-way communication device

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electrostrictive – magnetostrictive – or piezoelectric
Reexamination Certificate

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Two-way communication earpiece

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having acoustic wave modifying structure
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Two-way communications device having a single transducer

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having bi-directional transducer
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Two-wire conference apparatus with echo canceler without...

Electrical audio signal processing systems and devices – Dereverberators
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Two-wire interface for digital microphones

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
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Two-wired hearing aid system utilizing two-way communication...

Electrical audio signal processing systems and devices – Hearing aids – electrical – Remote control – wireless – or alarm
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