ホーム > Term: crown block
crown block
A pulley, set of pulleys, or sheaves at the top of a drill derrick on and over which the hoist and/or other lines run.
- スピーチの一部 noun
- 産業/ドメイン 炭鉱
- カテゴリ 炭鉱全般; Mineral mining
- Government Agency: USBM
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作成者
- ed.young
- 100% positive feedback
(Milwaukee, United States)