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Miners drill two or more holes into coal to place the explosive charges.
Two miners drill holes prior to placing charges. 'Holes are bored at proper intervals for shooting.'
Two miners drill before placing charges.
Miner drilling a hole for explosives at the Bishop Mine, Pocahontas Fuel Co.
Miner drilling holes for explosives at Jamison No. 9.
Miner Drilling a hole in mine.
Miner with drilling machine at Jamison No. 9.