Title:
SOUND SYSTEM FOR MODEL RAILROAD
United States Patent 3466797
US Patent References:
Acoustic sleep-inducing apparatus
- - 2644153
Variable volume horn system
- - 3173136
Acoustical signal generator
- - 3341842
Acoustic sleep-inducing apparatus
- - 2644153
Variable volume horn system
- - 3173136
Acoustical signal generator
- - 3341842
Inventors:
Hellsund, Borje Per Uno
Publication Date:
09/16/1969
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Assignee:
Borje, Per Uno Hellsund
Primary Class:
International Classes:
A63H19/14; A63H19/00; A63H19/14; G10K9/12