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070-The workman is shown drilling a hole in the roadway roof for a bolt which holds the various layers of rock together. The drilling machine used is the same as those used on the coalface and is powered by either electricity or compressed air. Picture by courtesy of the “Coal News” paper. |
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| Total images: 82 | Last update: 02/09/08 10:57 | Generated by JAlbum 7.2 & Chameleon | Help |