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Dual function transducer housing

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

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Dual horn folded soundpath loudspeaker

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

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Dual microphone assembly for mask

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

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Dual mode transducer for a portable receiver

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Body contact wave transfer
Patent

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Dual voice coil sound reproducing device

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

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Dual-frequency coaxial earphones

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having acoustic wave modifying structure
Reexamination Certificate

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Dynamic loudspeaker for producing high audio power

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

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Dynamic microphone

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

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Dynamic microphone

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

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Dynamic microphone

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

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Dynamic pressure sensing structure

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only
Reexamination Certificate

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Dynamic transducer device

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

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