FIELD: mining industry. SUBSTANCE: this refers to underground coal mining. Blows are inflicted on material in underground working until it is crumbling. Blows are made from top downwards to cause vibration of material, movement and partial crushing of its lumps. Used for this purpose is striking unit imbedded in material along length of working up to roof of hanging material. Striking unit is attached by flexible link to shield roofing and after crumbling of material it is removed under shield. EFFECT: high efficiency. 2 cl, 1 dwg
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