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rock crusher backing

US2970775A US732651A US73265158A US2970775A US 2970775 A US2970775 A US 2970775A US 732651 A US732651 A US 732651A US 73265158 A US73265158 A US 73265158A US 2970775 A US2970775 A US 2970775A Authority US United States Prior art keywords backing wearing plastic epoxy liner Prior art date 1958-05-02 Legal status (The legal status is an assumption and is not aThe rock crusher had remote control capabilities, which means the unit could be shut down at a distance, but according to the employer, close observation of the impactor chute while the crusher is operating is important. Early recognition that rock is backing up may prevent many frustrating, dirty hours of digging out mud and packed rock from ...

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