desk-wall automatic telephone set
automatic desk telephone
antisidetone telephone set
automatic answering telephone set
automatic telephone set
自动电话机系统
自动电话机
自动电话机自动电话机系统
自动电话装置
common battary telephone set
Common battery telephone set
common-battery (telephone) set
common-battery telephone set
dual-purpose telephone set
duplex radio telephone set
explosion-proof telephone set
extension set [= extension telephone set]
extension telephone set