An impact-activated toy suitable for use in a child's crib which is capable of generating a series of melodies in response to successive impacts by a child spaced by more than, for example, ten minutes from the termination of the preceding melody. A momentary push-button switch for the mother's use is...http://www.google.fr/patents/US4551114?utm_source=gb-gplus-shareBrevet US4551114 - Impact-activated toy
