Plug the hole with wax or silicone, then screw the bulb into a socket and let someone walk into the room and throw the switch.
把那个洞用蜡或硅酮封住，之后把灯泡重新旋入插座，静候等某人走入房间，打开开关。
"Clamp Type" knee switch which don't need to cut the table, drilling hole, install by screw. It's easy to fix them up.
“卡钳式”膝动开关，无须切割桌板、钻孔、装订螺丝，安装容易、简便。
The switch position of butterfly disc is limited by the adjusting screw pole on the worm gear transmission device. The indicating device displays the position of the valve switch.
蝶板的开关位置都由蜗轮传动装置上的调节螺杆限位，指示牌指示阀的开关位置。
The switch position of butterfly disc is limited by the adjusting screw pole on the worm gear transmission device. The indicating device displays the position of the valve switch.
蝶板的开关位置都由蜗轮传动装置上的调节螺杆限位，指示牌指示阀的开关位置。
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