If a product cannot be classified with the list of Classes, the Explanatory Notes and the Alphabetical List, the following remarks set forth the criteria to be applied:
A finished product is in principle classified according to its function or purpose. If the function or purpose of a finished product is not mentioned in any class heading, the finished product is classified by analogy with other comparable finished products, indicated in the Alphabetical List. If none is found, other subsidiary criteria, such as that of the material of which the product is made or its mode of operation, are applied.
A finished product which is a multipurpose composite object (e.g., clocks incorporating radios) may be classified in all classes that correspond to any of its functions or intended purposes. If those functions or purposes are not mentioned in any class heading, other criteria, apply.
Raw materials, unworked or semi-worked, are in principle classified according to the material of which they consist.
Goods intended to form part of another product are in principle classified in the same class as that product only in cases where the same type of goods cannot normally be used for another purpose.
When a product, whether finished or not, is classified according to the material of which it is made, and it is made of different materials, the product is in principle classified according to the material which predominates.
Cases adapted to the product they are intended to contain are in principle classified in the same class as the product.