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Piston diaphragm speaker
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Planar loudspeaker with spaced parallel magnetised strips
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Converter for carrying a signal current
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Diaphragm type magnetic transducer
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Planar diaphragm transducer with improved magnetic circuit
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Piston-diaphragm speaker
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Magnetic field device for planar loudspeaker
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TONE ARM FOR RECORD PLAYER
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Magnetic field structure for planar speaker
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Electromagnetic transducer
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Planar speaker
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Electromagnetic transducer
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