4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Electrostrictive, magnetostrictive, or piezoelectric
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Helmet with built-in speaker system and speaker system for...

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

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High displacement solid state ferroelectric loudspeaker

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

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