4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Having bi-directional transducer
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Communications terminal having a single transducer for handset a

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

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Portable recording system for telephone conversations

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

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Sound collecting device minimizing electrical noise

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having bi-directional transducer
Reexamination Certificate

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Sound collecting device minimizing electrical noise

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having bi-directional transducer
Reexamination Certificate

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Sound collecting device minimizing electrical noise

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having bi-directional transducer
Reexamination Certificate

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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
Reexamination Certificate

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