记发器 meaning in English

coder
register
transender

Multi frequency register signaling system for telephone automatic switching network
电话自动交换网多频记发器信号方式
Multi - frequency coding register
多频记发器
Register backward signal
记发器后向信号
All - senders - busy lamp
记发器全忙信号灯
The test methods for the technical specifications of multi - frequency register signaling for telephone automatic switching network
电话自动交换网多频记发器信号技术指标测试方法