... 2.double ,single panel both ok 3.ISO 9001-2000,TS16949:2000certificate. 4.inside and outside arm both ok 1. the bus ... brush. 3.ISO 9001-2000, ISOTS16949:2000certificationsIvy Machinery, the leading bus door system manufacturer in China, we can provide the optimum ... door panel for any vehicle (buses). Bus door panel(double door panel)