PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX ,PASS BOX PASS BOX is one kind of facilities, which located ... one interlock guard system controlled the inlet and the outlet of PASS BOX not be opened at the same time, in order ...