• NGK Spark Plug Co.,Ltd.
    • NGK Spark Plugs (U.S.A.), Inc.
    • NTK Technologies, Inc.
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    • Ceramica e Velas de Ignicao NGK do Brasil Ltda.
    • NGK Spark Plugs SA (Pty) Ltd.
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    • Woo Jin Industry Co.,Ltd.
    • NGK Spark Plugs (U.K.) Ltd.
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    • NGK Spark Plugs (France) S.A.S.
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