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First, the low industry concentration. Bearings in the world around us $ 30 billion in sales, 8 transnational corporations accounted for 75%~80% of the world. Germany the two companies accounted for 90% of its country, Japan 5 per cent of the national total, with 90%, United States 56% of 1 per cent of the national total. Zwz, the 10 biggest enterprises in China, sales accounted for 24.7% of the whole industry, the top 30 concentration of production is only 37.4%.