您要查找的是不是：
- Western panel type automatic telephone switch board 西部板式自动电话交换机
- crossbar type automatic telephone switch board 纵横制自动电话交换机
- semi-automatic telephone switch board 半自动电话交换机
- There is a switch board (control panel, distribution box) mounted on the wall. 在墙上装有一个开关板(控制盘、配电箱)。
- cordless telephone switch board 无塞绳电话交 换台
- manual telephone switch board 人工电话交换机
- A. B. Strowger invents the telephone switch, dial telephone. 史端乔发明自动电话交换系统。
- panel type automatic switch board 面板型自动交换机
- Spare parts: Product should with switch board, wiring box and platoon a place with a draught. 零配件：产品应附有开关板、接线盒和排风口。
- Hard chrome plated pistion and pump plunger ensuer durability and corrosion resistance. Foot switch board has quick lowering function when unload. 手动液压搬运车液压缸体为整体铸件结构,密封性强、柱塞杆、泵芯镀硬铬,耐磨、耐腐蚀。脚踏开关板具备空载快速下降功能。
- Board stool was installed inside frame house, power source of furnace of water spoon, carbon, switch board, thermometer, hygroscopic wait. 木屋内设置了木板凳，水勺、碳炉、开关电源板、温度计、湿度计等。
- If not,the call went to the company's in-house telephone switching system,or PBX (private branch exchange). 如果没有，电话就转到公司内的电话交换系统（即PBX，用户电话交换机）。
- SSPs are telephone switches,interconnected by SS7 links,that originate,terminate or tandem calls. SSP 是由 SS7 链路互连的电话交换机，用来发起、终止或汇接呼叫。
- Appeal Board Panel Town Planning 城市规划上诉委员会
- ICAC Witness Protection Review Board Panel 廉政公署保护证人覆核委员会小组
- An IP PBX is telephone switching equipment that resides in a private business instead of the telephone company. IP PBX是私人公司中的电话交换设备,而不是电话公司中的电话交换设备。
- SS7 is a switch-to-switch protocol that lets telephone switches set up calls, manage circuits and perform intelligent network functions. 七号信令系统（SS7）是交换机至交换机的协议，它让电话交换建立通话、管理电路和执行智能网络功能。
- SSPs are telephone switches, interconnected by SS7 links, that originate, terminate or tandem calls. SSP 是由 SS7 链路互连的电话交换机，用来发起、终止或汇接呼叫。
- D.Talley, "Basic Telephone Switching Systems", Hayden Book Company, Rochelle Park, N.J. 1969. 由坐标式交换器所组成的交换网路。
- I groped for the light switch in the dark room. 我在黑暗的房间里摸索着找电灯开关。
