The design of a part of a complex product shall be regarded as new and having its own character only to the extent that:
a) The part, once incorporated into the complex product, remains visible during normal use of that product by the end user, with the exception of maintenance, service or repair;
b) The visible features of the part as such fulfil the conditions of novelty and own character.
A complex product is considered to be a product composed of multiple parts that can be replaced.