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List any four drilling machine used in industrial sector.
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Solution:

Classification of drilling machine

  1. Portable drilling machine

  2. Bench drilling machine

  3. Sensitive drilling machine

  4. Upright or column drilling machine

  5. Radial drilling machine

  6. Gang drilling machine

  7. Multi-spindle drilling machine 8. Vertical drilling machine

  8. Automatic drilling machine 10. Deep hole drilling machine

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