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ES373951A1
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Recording equipment for sonar and sound systems by eco. (Machine-translation by Google Translate, not legally binding)
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US3518676A
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Apparatus for directional stabilization of an acoustic beam emitted from a shipborne echo sounding or sonar transducer
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GB1209097A
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Recording apparatus for echo sounding systems
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GB1219435A
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Sonar or echo sounding receiver systems
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GB1218220A
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Echo sounding transducers
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GB1177456A
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Methods and Apparatus for the Regulation of the Angular Velocity of the Shaft of a Direct Current Electric Motor
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GB1174012A
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Sonar Installations
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US3426725A
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Sonar systems in vessels
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