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GB899474A
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Improvements in or relating to electroacoustic transducers
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US2967957A
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Electroacoustic transducer
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GB854642A
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Improvements in or relating to oscillographs
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US3090939A
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Tessellated electromechanical transducer element
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US2738173A
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Reduction of friction between a fluid and the wall of a conduit through which the fluid is passing
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US2746813A
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Means for reducing static friction
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US2830283A
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Directional characteristics of electroacoustic transducers and method for utilizing the same
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US2702260A
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Apparatus and method for the generation and use of sound waves in liquids for the high-speed wetting of substances immersed in the liquid
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US2613261A
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Underwater transducer
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US2604182A
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Loud-speaker with a tapered horn coupled to the speaker diaphragm
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GB624510A
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Electro-acoustic transducer
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US2496484A
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Magnetostrictive phonograph pickup
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US2531067A
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Phonograph needle
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US2518805A
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Resonant chamber for microphones
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US2496483A
|
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Loud-speaker with diaphragm an integral part of outer casing
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US2518993A
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Electroacoustic transducer
|
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US2445276A
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Electrodynamic loudspeaker
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US2475148A
|
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Transducer means
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US2472714A
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Piezoelectric sound pressure microphone
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US2645416A
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Vending system
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