C. Roger Anderson

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Brush contact for phonograph tone arm dynamic stabilizer

Dynamic information storage or retrieval – With storage medium cleaning or electrostatic chanrge... – By tone arm attachment
Patent

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Hearing aid assembly having external directional microphone

Electrical audio signal processing systems and devices – Hearing aids – electrical – Directional
Reexamination Certificate

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Loudspeaker horn with adjustable angle of dispersion

Acoustics – Sound-modifying means – Intensifying horn
Patent

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Microphone

Patent

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Microphone for use in a vibrating environment

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Thermal response to – or generation of – sound vibration
Patent

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Profile ID: LFUS-PAI-P-1279461

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