PRIMARY CRUSHING: MOBILE JAW CRUSHERS. Jaw crushers operate according to the principle of pressure crushing. The raw feed is crushed in the wedge-shaped pit created between the fixed crusher jaw, and the crusher jaw articulated on an eccentric shaft.
Classification: Wage: 1.(A). Cranes, tower cranes, and derricks with or without attachments with a lifting capacity of over 100 tons or cranes, tower cranes, and derricks with boom, leads and/or jib lengths measuring 176 feet or longer, master mechanic, foreman, blaster.