An input terminal and a first output terminal having lead portions are juxtaposed at the bottom of the case of a ladder-type piezoelectric filter, and substantially rectangular series resonators adapted to vibrate in a longitudinal vibration mode are disposed on the input terminal and the first output...http://www.google.com/patents/US6060963?utm_source=gb-gplus-sharePatent US6060963 - Ladder-type piezoelectric filter with lid providing predetermined contact pressure and method of manufacturing same
