نمایش نتیجه 1 تا 1 از 1 نتیجه یافت شده برای double-drum hoist:
n: a device consisting of two reels on which wire rope is wound that provides two separate hoisting drums in the assembly. The main drum is used for pulling tubing or drill pipe;the second drum is used for coring and swabbing. See hoist.
n: A kind of hoisting tool composed by two cylinders on which the wire rope can reel
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