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3 the secretary states baker rock crushing company “agreed . . . that a hydraulic hose had broken at some time prior to the inspection which resulted in [citation no. ].” (pet’r’s pre-hearing report 2, august 4, ). 4 david lemen has worked for baker rock crushing company for 30 years and has been the superintendent for 17.Businessindustry information. crushers. crushers are machines designed to reduce large waste materials for easier disposal or recycling. one of the most common types of pulverizers, crushers are typically used to reduce the size of large rocks, changing them into more easily-handled small rocks, rock dust or gravel.crushers are able to break apart or compress soft materials such as limestone.