Coal drill used in mining

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Coal drill used in mining
Posting date : Oct 24, 2013
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27-
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Brief Introduction 1. Drilling speed is fast 2. Drilling is wide 3. Durable Detail Introduction Coal drill 1. Bit is to promote the coal ministry has the list of product, the hardness is divided into two categories, type I is suitable for soft rock drill, is suitable for hard rock and hard rock drilling 2. Drilling drilling speed, range, time connecting method is simple and durable

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