Electromagnetic transducers for underwater low-frequency high-power use
US4660186A
Electromagnetic transducers for underwater low-frequency high-power use
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Low frequency portable lightweight sonar systems and their method of deployment for greatly increasing the efficiency of submarine surveillance over large areas
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Coin-operated vending systems
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Underwater depth sounder with variable beam transducer
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Automatic camera focusing means
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Intrusion alarm system with improved air turbulence compensation
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Automatic leakage detection system for pipelines carrying fluids
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Directional ultrasonic transducer with reduced secondary lobes
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Electroacoustic transducer of the flexural vibrating diaphragm type
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Dual electroacoustic transducers
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High-power underwater transducer with improved performance and reliability characteristics and method for controlling said improved characteristics
