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Device for abrasive wear testing of materials
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Internal combustion engine lorry body for haulage of muck
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Turbofan for open mines
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Method of subterranean mining of ore deposits
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Yealdable ceiling pillar
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Controllable rate scaler
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Pulse synchronization device
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Apparatus for handling track units
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Apparatus for loading belt conveyer
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Quarry airing arrangement
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Arrangement for airing quarries in inversion periods
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Method of entry driving by drilling and exploding method
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Method of mining sloping ore bodies
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Device for obtaining difference frequency of pulses
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