International Patent Classification f: Mechanical Engineering, Lighting, Heating, Weapons, Blasting.

国际专利分类F：机械工程，照明，加热，武器，爆破。

youdao

International Patent Classification f: Mechanical Engineering, Lighting, Heating, Weapons, Blasting.

国际专利分类F：机械工程，照明，加热，武器，爆破。

youdao