Different types of roof in underground coal mines.

[@anjanghosh7976]

Congratulations for 1k

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[@prakashmishra8486]

Nice sir 😀🎉

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[@anjaanmukherjee9441]

Very Good Sir

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[@RakshitMondal]

Nice sir

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[@004deborjotysarkar4]

Very good sir😮

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[@rajeshgope4318]

👍👍

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[@RahulYadav-kk5qd]

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[@kingshukchakraborty7]

Nice sir

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