The C.P. Hole-boring machine is being used to bore apertures in the coal face - the same depth as the undercut made by
The C.P. Hole-boring machine is being used to bore apertures in the coal face - the same depth as the undercut made by coal-cutter, ready for an explosive charge. Operators must take care that the top aperture does not penetrate the roof. July 1946 P017703
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