Uchunguzi wa Mpira wa kauri ya Silicon Nitride na Watengenezaji: Toshiba, CoorsTek, Hoover Precision, ITI, Winsted Precision Ball, Ortech, Redhill-balls, THOMSON, Spheric Trafalgar, Boca Bearing, Enduro, Timken, Salem Specialty Ball, Kyocera, SKF Kama itaonyeshwa. chini, kupungua kubwa kwa samaki-samaki.
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