Hemispherical beam patterns for range tracking, acoustic release systems and data communication.

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Model T313 7kHz - 16 kHz	Model T279 12 kHz - 19 kHz	Model T235 10 kHz - 25 kHz
Model T257 16 kHz - 30 kHz	Model T204 40 kHz - 70 kHz	Model T218 18 kHz - 30 kHz
Model T216 45 kHz - 75 kHz	Model T226 45 kHz - 75 kHz