Home > 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.
- Szófaj: noun
- Ipar/Tárgykör: Mining
- Kategória: General mining; Mineral mining
- Government Agency: USBM
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- ed.young
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(Milwaukee, United States)
