الصفحة الرئيسية > Term: four-piece set
four-piece set
Squared timber frame used in underground driving to give all around support to weak ground. A cap is supported by two posts on a sill-piece or sill.
- 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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(V.I.P) 21084 النقاط - 100% positive feedback
(Milwaukee, United States)
