Speaking tubes

... 磁带脱磁设备 Demagnetizing apparatus for magnetic tapes 传话筒 Speaking tubes 电子监听仪器 Monitoring apparatus, electric ...

 voice tube

... voice rotating beacon 旋转音响信标 voice tube 传话筒 voice tube 传声筒 ...

 airfone

... 传话管 voice pipe; 传话器 microphone; 传话筒 airfone; voice pipe; voice tube; speaking tube ...

 speaking trumpet

传话筒；扩音器。 speaking trumpet 传声筒；扩音器 megaphone ..