Transducer apparatus (10) responsive to external perturbations is disclosed having an electrically responsive transducer circuit (12) energized when a display member (18) and an elongate member (20) move from a gravity determined quiescent orientation (30A) therebetween to an external perturbation driven...http://www.google.fr/patents/US5473307?utm_source=gb-gplus-shareBrevet US5473307 - Transducer apparatus responsive to external perturbation
Transducer apparatus responsive to external perturbation
