长途电话自动交换机
automatic toll switching system
全自动长途电话交换机
automatic toll switching system
半自动电话交换机
automanual telephone switchboard
semi-automatic telephone switch board
步进制市内用自动电话交换机
step-by-step system local automatic telephone exchange
汇接用纵横制自动电话交换机
concourse-connection longitudinal-transverse auto-telephone exchange
全继电器制自动电话交换机
all relay automatic telephone system
小型自动电话交换机
UAX Unit Automatic Exchange
专用自动电话交换机
PABX
private automatic branch exchange
Battered
private automatic telephone exchange
自动电话交换机
automatic telephone exchange
automatic telphone exchange
automatic exchange
dial exchange
dial telephone exchange
automatic telephone switchboard
纵横制自动电话交换机
longitudinal-crossbar auto-telephone exchange
longitudinal-transverse system automatic telephone exchange
crossbar automatic telephone exchange
crossbar type automatic telephone switch board
长途电话交换机
long distance telephone exchange
程控数字长途电话交换机
SPC digital toll exchange