Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1981-09-28
1988-02-23
Trafton, David L.
Communications: electrical
Audible indication
Ultrasonic pest control
84 952, 340 52E, 340328, 340691, G08B 300
Patent
active
047273585
ABSTRACT:
A plug-in type warning device to be substituting for the normal initially installed seat belt warning buzzer, or the like, in automobiles, the plug-in type warning device having a pleasant signal in the form of a musical signal, voice signal, or the like in lieu of the normal harsh buzzer sound.
REFERENCES:
patent: 3525862 (1970-08-01), Carter et al.
patent: 4232287 (1980-11-01), Slavin et al.
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