crossbar type automatic telephone switchboard的意思|示意

纵横制自动电话交换机 ... 专用自动电话交换机 pabx; private automatic branch exchange; private automatic telephone exchange 纵横制自动电话交换机 cro ar automatic telephone exchange; cro ar type automatic telephone switch board; crossbar automatic telephone exchange; crossbar automatic telephone system; crossbar dial exchange; crossbar type automatic telephone switch board; crossbar type automatic telephone switchboard; longitudinal-cro ar auto-telephone exchange; longitudinal-crossbar auto-telephone exchange; longitudinal-tra verse system automatic telephone exchange; longitudinal-transverse system automatic telephone exchange 程控电话交换机 digital telephone switch board; spc telephone exchange ...