This historical image, which was provided by the Center for Disease Control's (CDC), National Institute for Occupational Safety and Health (NIOSH), depicted one of the subterranean passageways in a coal mine, which had been configured to be a 'haulageway', which is a corridor designated as a transport route, usually equipped with a track, i.e., rail, or a conveyor belt. Note the roof supports, constructed from what appeared to be very large tree trunks.
CDC/ Barbara Jenkins, NIOSH
December 4, 2012
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