Second, the bottom panel of the surface to avoid led drilling hole position is fixed by the screw to install wall on, installed according to the design of plate and fixed thread on each word.

将面板底面避开LED位置钻孔用螺丝固定再安装壁面上，按设计之板安装好，并将每个字的线头固定好。

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A section bar of a self tapping screw for saving drilling hole is provided with high-tightening force, which belongs to the design preparation technical field of the section bar.

可免钻孔上自攻螺丝并具有高紧固力的型材，属型材的设计制造技术领域。

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"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。

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