The 65-pound, 48-by-40-inch platforms are slapped onto a conveyer belt and run through an MRI-like chamber, where lasers scan them for defects.

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It helps to modify the rock mass, can size up large pieces sooner and transport rock on a continuous conveyer belt, he said.

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The Tory MP accused the government of failing to outline a clear strategy for taking young people off the "conveyer belt of crime" and putting more police on the streets.

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