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Does anyone know the name of the domestic manufacturer of excavator slewing bearing?

For production or bulk purchase, please contact the following manufacturers: Maanshan Fiona Fang slewing bearing Co., Ltd., Maanshan Tongli slewing bearing Co., Ltd., Xuzhou Fenghe slewing bearing manufacturing Co., Ltd. and Xuzhou Tianlong slewing bearing. You can contact Shanghai Jifeng Machinery Equipment Co., Ltd. and Xiamen Youmujin for a single purchase.