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In hand operated rings in ‘auger and shell boring’ the depth of which it can be used is _________

In hand operated rings in ‘auger and shell boring’ the depth of which it can be used is _________ Correct Answer 25 m

The hand operated rings in ‘auger and shell boring’ are used for depths up to 25 m and the mechanised rings up to 50 m. In auger boring, hand augers are used for depths up to about 6 m.

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