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RU1776782C
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Rotary-impact drilling machine
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Air distribution arrangement for mine ventilation and air-heating units
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Cutting unit of stoping cutter-loader
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Tail portion of belt telescopic conveyer
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Polymeric moulding composition
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Method of determining necessary supporting capability of preserved working protection apparatus
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Method of excavating thick steep coal seams
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Method of mining coal seams
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Shoe for the roof support of horizontal preparatory workings
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