The various types of drills and bits used for drilling into rocks in the United States. A Corliss air compressor that furnishes air power for rock drilling. Men in a mine in northern Michigan as they work with rotator hammers to sink a shaft 1700 feet below the surface. Six workers drill with rotators. A worker drills into the wall and roof of the mine. An auger rotator being used to drill into a soft ore bench.
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