COAL EXTRACTION PROCESS IN OPEN CAST COAL MINE HOW??

COAL EXTRACTION PROCESS IN OPEN CAST COAL MINE | कोयला खान में कोयला निकालने की प्रक्रिया ??

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In this tutorial I have explained How coal is extracted in Open Cast Coal Mine by mechanical extraction method.
Hello friends, I am Ashis, I am a Mechanical Engineer. Welcome to my channel A's Tech Talk. Please stay with me also LIKE, SHARE & SUBSCRIBE my channel.
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