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Electroacoustic transducer
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Patent number 6,169,810
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Issue date Jan 2, 2001
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Microtronic Nederland, B.V.
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A. Z. van Halteren
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Transducer
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Patent number 5,809,158
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Issue date Sep 15, 1998
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Microtronic Nederland, B.V.
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Aart Zeger van Halteren
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Transducer
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Patent number 5,757,947
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Issue date May 26, 1998
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Microtronic Nederland, B.V.
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A. Z. Van Halteren
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H04 - ELECTRIC COMMUNICATION TECHNIQUE