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。

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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。

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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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As more carriers make the full switch over to 4G service, they will need to manufacture new circuit boards.

FORBES: Rogers Helps Wireless Carriers Get Up To (4G) Speed