double core barrel drill 双筒取心钻具

double core-barrel drill 双岩心管钻探

double-core barrel drill [油气] 双岩芯筒钻头

double core barrel with diamond 金刚石单动双管

single rotary double core barrel 单动双管钻具

double-tube core barrel 双筒取心筒

double tube core barrel 复式岩心管

double tube core barrel sampler 回转取样器 ; 双重岩芯管取样器

double type core barrel 双筒式岩心筒