Only install switchgear and/or switch boards in enclosed rooms suitable for electrical equipment.
开关设备只能安装在适合于电气设备工作的户内场所。
This test system may be used on a variety of devices, such as connectors, switch es, multiple conductor cables, and printed circuit boards.
该测试系统可被用于各种装置，例如连接器、开关、多芯电缆和印制板。
Invention of Keith Line Switch, resulting in enormous reduction in cost of automatic boards. First used at Wilmington, Delaware.
基思寻线机的发明，导致自动交换台的成本大幅降低，并首次用于特拉华州的威明顿。
Invention of Keith Line Switch, resulting in enormous reduction in cost of automatic boards. First used at Wilmington, Delaware.
基思寻线机的发明，导致自动交换台的成本大幅降低，并首次用于特拉华州的威明顿。
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