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Asahi Glass
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Chichibu Onoda Cement (now Taiheiyo Cement)
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Covalent Materials Corp
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Fujimi Incorporated
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Konoshima Chemical
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Krosaki Harima Corporation
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Kuramoto Seisakusho
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Mino Ceramic
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NGK Insulators
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NGK Spark Plug
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Nichias
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Nihon Ceratec
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Nihon Kenshi ("Nikken")
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Nihon Micro Coating
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Nikko Company
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Nippon Electric Glass
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Nippon Sheet Glass
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Noritake
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Ohara Inc
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SEC Corp
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Shinagawa Refractories
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Sumitomo Osaka Cement
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Taiheiyo Cement
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Tokai Carbon
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Toshiba Ceramics (Now, Covalent Materials Corp)
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Toto Ltd
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