http://www.google.com/patents?scoring=2&q=%22type+bar%22+bearing+over&btnG=Search+Patents
http://www.google.com/patents?scoring=2&q=%22type+bar%22+bearing+annular+disk&btnG=Search+Patents
http://www.google.com/patents?scoring=2&q=%22type+bar%22+bearing+annular+disk&btnG=Search+Patents