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Patent applications and USPTO patent grants for ZHEN; Zhencai.The latest application filed is for "tension balance system and method for steel wire ropes on friction hoisting driving end of ultra-deep well".
Patent | Date |
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Tension Balance System And Method For Steel Wire Ropes On Friction Hoisting Driving End Of Ultra-deep Well App 20210053805 - ZHEN; Zhencai ;   et al. | 2021-02-25 |
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