4. Electrical audio signal processing systems and devices
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Room mode bass absorption through combined diaphragmatic and...

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

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Rotary canister base

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

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Rotary low-frequency sound reproducing apparatus and method

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

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Rotary low-frequency sound reproducing apparatus and method

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – By modifying fluid flow
Patent

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Rotary sound transducer

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

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Rotatable removeable speaker assembly

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Mounting or support feature of housed loudspeaker
Reexamination Certificate

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Ruggedized solar charged hearing aid

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

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