Home > Term: drop staple
drop staple
Eng. An interior shaft, connecting an upper and lower seam, through which coal is raised or lowered.
- ส่วนหนึ่งของคำพูด: noun
- อุตสาหกรรม/ขอบเขต: Mining
- Category: General mining; Mineral mining
- Government Agency: USBM
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- ed.young
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(Milwaukee, United States)
