实践表明，用该机掘进天井与普通掘进法和吊罐法相比，可大大减少成井费用，经济效益较好。
It has been proved in practice that this machine can significantly reduce raising cost and yield better economical results by comparison with conventional raising and cage raising methods.
实践表明，用该机掘进天井与普通掘进法和吊罐法相比，可大大减少成井费用，经济效益较好。
It has been proved in practice that this machine can significantly reduce raising cost and yield better economical results by comparison with conventional raising and cage raising methods.
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