long helical drilling machine 长螺旋钻孔机
long hole drilling machine 深孔钻机
The successful development of this drilling machine provided reliable safety equipment for coal mines to practise gas drainage technology by long holes.
钻机的研制成功为煤矿实施长距离钻孔抽放瓦斯工艺提供了可靠的安全装备。
Currently has a long auger, lime machine, High Pressure Jet Drilling Rig, strong drill Roofbolter more than 10 varieties of five series.
目前已形成长螺旋钻机、灰土桩机、高压旋喷钻机、强冲钻机、锚杆钻机五大系列10多个品种。
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