4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Plural or compound reproducers

SP Technologies LLC

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Earpiece with an inertial sensor

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
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Ultra short range communication with sensing device and method

Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
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Voice communication device

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