4. Illumination
  5. With cane, baton, umbrella or club

Yen Chin-Fa

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Feedback noise-eliminating microphone circuit

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent

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Multi-purpose traffic director's stick

Illumination – With cane – baton – umbrella or club
Patent

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Structure of a loudspeaker

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

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Profile ID: LFUS-PAI-P-1026613

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