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Resonant electroacoustic transducer with increased band width response
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Method of manufacturing electroacoustic transducer elements which operate in the vicinity of resonance
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Piezoelectric electroacoustic transducers of the bi-laminar flexural vibrating type
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Electroacoustic transducers of the bi-laminar flexural vibrating type with an acoustic delay line
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Directional energy receiving systems for use in the automatic indication of the direction of arrival of the received signal
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Sonic ranging systems to eliminate errors due to variations in the sound velocity in the medium
