设备是一个生产镁粉颗粒的系统。根据你（提供）的信息，系统整体进口。这是一个相当大范围的系统，包含了镁变成颗粒要经过的不同的部件。该系统的主要用途是接受在炉腔加热融化镁的矿石，用鼓风机强制（它们）通过喷嘴进入有冷却气体的腔体，通过喷嘴的小颗粒基于冷却和（液体）镁的表面张力会形成球形或橄榄球形。

In your previous submissions, you propose classifying the merchandise as a composite machine under subheading 8454.30.0090, Harmonized Tariff Schedule of the United States (HTSUS), which provides for Converters, ladles, ingot molds and casting machines, of a kind used in metallurgy or in metal foundries, and parts thereof: Casting machine … Other. Alternatively, you propose classification in subheading 8479.81.0000, HTSUS, which provides for Machines and mechanical appliances having individual functions, not specified or included elsewhere in this chapter; parts thereof: Other machines and mechanical appliances: For treating metal, including electric wire coil-winders.

在你过去的申请中，你建议将这个货物按组合式机器归类在8454.30.0090，美国税则，品目内容是：金属冶炼及铸造用的转炉、浇包、锭模及铸造机以及零件：铸造机。。。其他。另一个选择，你建议货物分类为8479.81.0000，美国税则，品目内容是：本章其他品目未列名的具有独立功能的机器及机械器具；零件：处理金属的机械，包括线圈绕线机。

In understanding the language of the HTSUS, the Explanatory Notes (“ENs”) may be utilized. The ENs provide guidance in the interpretation of the Harmonized Commodity Description and Coding System at the international level. Although not dispositive nor legally binding, the ENs provide a commentary on the scope of each heading of the HTSUS. See T.D. 89-80, 54 Fed. Reg. 35127, 35128 (August 23, 1989).