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Noise suppressor
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Patent number 5,131,047
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Issue date Jul 14, 1992
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Matsushita Electric Industrial Co., Ltd.
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Hiroyuki Hashimoto
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Silencer
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Patent number 5,093,864
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Issue date Mar 3, 1992
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Kabushiki Kaisha Toshiba
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Yasuyuki Sekiguchi
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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Active acoustic attenuator
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Patent number 4,473,906
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Issue date Sep 25, 1984
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Lord Corporation
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Glenn E. Warnaka
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G10 - MUSICAL INSTRUMENTS ACOUSTICS