홈 > Term: not previously known to exist
not previously known to exist
These words refer to the time of the location and commencement of the tunnel and not to the respective times of the discoveries of the various veins in the tunnel.
- 품사: noun
- 분야/도메인: 광업
- 카테고리: 일반 광산; Mineral mining
- Government Agency: USBM
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- ed.young
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(V.I.P) 21084 포인트 - 100% positive feedback
(Milwaukee, United States)
