4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer

United Recording Electronic Industries

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Automatic frequency response plotting system

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent

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Coaxial loudspeaker system

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

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High frequency horn

Acoustics – Diaphragm and enclosure – With horn
Patent

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Profile ID: LFUS-PAI-P-1216435

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