This historical image, which was provided by the Center for Disease Control's (CDC), National Institute for Occupational Safety and Health (NIOSH), depicted a miner cutting a rockface using a pneumatically-powered stephammer, which was equipped with a dust control device situated at a point from which dislodged debris would emanate. The particulates would be vacuumed away, thereby, keeping the airspace around the worksite free of airborne irritants. The man was not wearing a filtered breathing mask, goggles, gloves, or ear plugs, all of which would be required as standard protective accessories today.
CDC/ Barbara Jenkins, NIOSH
December 4, 2012
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