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Brief description of the drawings
FIG. 1 is a longitudinal sectional front view of a conventional ultrasonic transducer, FIG. 2 is a
longitudinal sectional front view of the ultrasonic transducer according to the present invention,
FIG. FIG. 5 is a graph showing the sensitivity waveform of the ultrasonic handset of FIG.
Reference Signs List 3 composite vibrator 7 case 8 opening 9 meshed window member 16
circumferential wall 17 cylindrical body 18 collar 19 19 ·space.