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Device for detection of falling objects that distinguishes between the rocks retained or allowed to pass according to their size and impact energy.?keyword=Device for detection of falling objects that distinguishes between the rocks retained or allowed to pass according to their size and impact energy.?keyword=Device for detection of falling objects that distinguishes between the rocks retained or allowed to pass according to their size and impact energy.?keyword=Device for detection of falling objects that distinguishes between the rocks retained or allowed to pass according to their size and impact energy. 专利,更快更准确