An alerting device for a paging receiver for generating vibration motion in the paging receiver housing. The alerting means comprises an electric motor, an eccentric weight, and a linking means. The electric motor is activated in response to an alert signal for rotating a driving shaft. The driving shaft...http://www.google.es/patents/US4794392?utm_source=gb-gplus-sharePatente US4794392 - Vibrator alert device for a communication receiver
Vibrator alert device for a communication receiver
