JUS K R1 107-1989 ore drilling eauipment ore barreis Heads type 8《空心钻具 取芯筒 8类钻头》.pdf

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JUS K R1 102-1989 ore drilling eguipment ore barreis Types B and BT ore lifters《空心钻具 取芯筒 B类和BT类提芯器》.pdf

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