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Variable pattern, collapsible, directional transducer

Acoustics – Diaphragm – Microphone type
Patent

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Vibrating diaphragm of false speaker structure

Acoustics – Diaphragm – Mounting or suspension means
Reexamination Certificate

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Vibration system part for speaker device and manufacturing...

Acoustics – Diaphragm – Critically defined material or coating
Reexamination Certificate

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Vibratory diaphragm for loudspeaker

Acoustics – Diaphragm – Critically defined material or coating
Patent

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Vibratory elements for audio equipment

Acoustics – Diaphragm – Critically defined material or coating
Patent

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Vibratory material of paper pulp and carbon fibers

Acoustics – Diaphragm – Critically defined material or coating
Patent

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