发明申请
US20070252683A1 Transporter Motor Alarm 有权
运输车辆报警

Transporter Motor Alarm
摘要:
An audio alarm for a transporter having an electric motor. The alarm has a signal generator for generating a signal within the audible frequency range and a modulator for modulating a current that is applied to the electric motor in accordance with the signal generated by the signal generator.
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