"That evolution in technology has turned what was weakness into a strength, " Noji boasts.

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After nearly 40 years at his company, Noji is philosophical about the rivalry.

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The GPS-armed fleet provides data that help Noji match production with estimated demand--he needn't rely on what dealers pass along.

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"There aren't any good reasons for Japanese life insurance firms to rush to invest overseas, given the recent rise in domestic government bond yields, " Mr. Noji added.

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Noji's peek into China comes from 23, 000 heavy-duty vehicles spread across the nation's vastness, each fitted with an antenna that via satellite link tells Komatsu where it is and what it's doing.

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