Steam operated horn
United States Patent 2434175
US Patent References:
/0606668.html
- - 0606668

Sound producing device
- - 1844226

Sound reflector
- - 1624873

/1289065.html
- - 1289065

Amplifying horn
- - 1522095


Inventors:
Ozols, Karlis V.
Publication Date:
01/06/1948
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Assignee:
Ozols, Karlis V.
Primary Class:
116/147
Other Classes:
116/142R, 116/137R, 137/624.140, 137/494
International Classes:
G10K9/04; G10K9/00
US Patent References:
1486650
2019596Acoustic signaling apparatus
1653119Device for forming far-reaching sound pencils and application of latter