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  5. Megaphones
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Hands-free megaphone

Electrical audio signal processing systems and devices – Megaphones
Reexamination Certificate

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Lighted enhanced bullhorn

Electrical audio signal processing systems and devices – Megaphones
Patent

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Method and apparatus for a portable public address system

Electrical audio signal processing systems and devices – Megaphones
Reexamination Certificate

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Portable voice amplifier

Electrical audio signal processing systems and devices – Megaphones
Patent

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Voice amplification adapter assembly for face mask

Electrical audio signal processing systems and devices – Megaphones
Patent

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Voice amplifier for mask

Electrical audio signal processing systems and devices – Megaphones
Reexamination Certificate

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Voice amplifier for mask

Electrical audio signal processing systems and devices – Megaphones
Reexamination Certificate

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