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Soundproofing materials
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Patent number 5,318,837
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Issue date Jun 7, 1994
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Matsushita Electric Industrial Co., Ltd.
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Minoru Yoshinaka
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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Radio wave absorbing material
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Patent number 5,310,598
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Issue date May 10, 1994
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Matsushita Electric Industrial Co., Ltd.
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Minoru Yoshinaka
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H01 - BASIC ELECTRIC ELEMENTS
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Soundproofing materials
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Patent number 5,164,260
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Issue date Nov 17, 1992
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Matsushita Electric Industrial Co.Ltd.
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Minoru Yoshinaka
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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