While the parallel resonators P1 and P2 in the above illustrated embodiment are {HEAD ~ square devices} that utilize {TAIL ~ a contour vibration mode}, they may alternatively be rectangular devices like series resonators S1 and S2 that utilize a longitudinal vibration mode 
utilize
While the parallel resonators P1 and P2 in the above illustrated embodiment are { HEAD ~ square devices } that utilize { TAIL ~ a contour vibration mode } , they may alternatively be rectangular devices like series resonators S1 and S2 that utilize a longitudinal vibration mode
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH