Acoustics – Sound-modifying means – Intensifying horn
Patent
1995-03-02
1997-05-20
Dang, Khanh
Acoustics
Sound-modifying means
Intensifying horn
181190, 181192, 181182, G10K 1100
Patent
active
056314507
ABSTRACT:
A megaphone includes a pair of hollow bodies which are assembled at a connecting portion to open and close freely, wherein a tuning part is formed by denting the center of a flat part of each hemiconical main part to provide a level face around the tuning part.
REFERENCES:
patent: 4703829 (1987-11-01), Hardt
patent: 5094317 (1992-03-01), Ladendorf
patent: 5160815 (1992-11-01), Prater
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