홈 > Term: floor sill
floor sill
A large timber laid flat on the ground or in a level, shallow ditch to which are fastened the drill-platform boards or planking.
- 품사: noun
- 분야/도메인: 광업
- 카테고리: 일반 광산; Mineral mining
- Government Agency: USBM
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작성자
- ed.young
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(Milwaukee, United States)
