4. Electrical audio signal processing systems and devices
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Ultra-directional microphones

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

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Ultra-directional speaker

Electrical audio signal processing systems and devices – One-way audio signal program distribution
Reexamination Certificate

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Ultra-directional speaker system and speaker system drive...

Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo speaker arrangement
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Ultralight loudspeaker enclosures

Electrical audio signal processing systems and devices – Having non-electrical feature
Patent

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Ultrasonic frequency expansion processor

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

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Ultrasonic speaker and projector

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

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Ultrasonic transducer and ultrasonic speaker using the same

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

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Ultrasonic transducer for parametric array

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

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Ultrasonic transducer for parametric array

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

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Ultrasonic transducer, ultrasonic speaker, acoustic system,...

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

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Ultrasonic transducer, ultrasonic speaker, acoustic system,...

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

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Ultrasonic transducers

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having electrostatic element
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Ultrasound based parametric loudspeaker system

Electrical audio signal processing systems and devices – One-way audio signal program distribution
Reexamination Certificate

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Ultrasound bell attachment for stethoscope

Electrical audio signal processing systems and devices – Stethoscopes – electrical
Patent

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Under-the-ear mounting headset

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

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Unidirectional dynamic microphone

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

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Unidirectional microphone

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Thermal response to – or generation of – sound vibration
Patent

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Unidirectional microphone

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

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Unidirectional second order gradient microphone

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

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Unipole radiator loudspeaker

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

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