172354 ⎘
Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves with indication presented on cathode-ray tubes
THREE-DIMENSIONAL ACOUSTIC DETECTION AND IMAGING VIA HEXIDRANT ISOLATION AND DELAY-MIXING
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#5System and method for automatic detection of a sonar contact
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