الصفحة الرئيسية > Term: porthole
porthole
The opening or passageway connecting the inside of a bit or core barrel to the outside and through which the circulating medium is discharged.
- قسم من أقسام الكلام: noun
- المجال / النطاق: التعدين
- الفئة: تعدين عام; Mineral mining
- Government Agency: USBM
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المنشئ
- ed.young
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(Milwaukee, United States)