إرسال محطة كسارة اليد في فرنسا. The bearings are what make the cones on a Tricone spin. There are four common types of bearings standard open roller bearings, aircooled roller bearings, sealed roller bearings, and sealed journal (friction) tricorne or tricorn is a style of hat that was popular during the 18th century, falling out of style by 1800, though actually not ...