4. Electrical audio signal processing systems and devices
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Piezoelectric speaker

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

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Piezoelectric speaker

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

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Piezoelectric speaker

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

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Piezoelectric speaker, method for producing the same, and...

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

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Piezoelectric speakers

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

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Piezoelectric transducer

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

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Piezoelectric transducer

Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent

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Piezoelectric transducer adapted to bridge of stringed...

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

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Piezoelectric transducers

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

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Piezoelectric transducers

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

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Piezoelectric vibrating elements and piezoelectric electroacoust

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

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Pillow in the form of a stuffed toy or 3-D character toy...

Electrical audio signal processing systems and devices – Miscellaneous
Reexamination Certificate

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Pillow speaker apparatus and method

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

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Pilot cancellation circuit

Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent

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Pilot signal cancelling system

Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent

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Pilot signal detecting circuit for AM stereo signals

Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent

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Pilot signal detection circuit

Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent

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Pilot tone cancelling circuit for AM stereo decoder

Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent

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Pipe microphone device

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

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Piston-type panel-form loudspeaker

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Driven diverse static structure
Reexamination Certificate

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