Unlock Advanced Research with PRISMAI Integrated with over 4 crore judgments and laws — designed for legal practitioners, researchers, students and institutions - Know your Kanoon - Doc Gen Hub - Counter Argument - Case Predict AI - Talk with IK Doc - ... Upgrade to Premium Document Options Get in PDF Print it! [Cites 0, Cited by 0] [Section 171] [Entire Act] Union of India - Subsection Section 171(3) in The Coal Mines Regulations, 2017 (3)No narrow main or advance gallery shall be driven more than three meters ahead of the widened gallery.