About patents. Subordinate rights are not necessary technical features, are they?

Dependent claim: it can be a technical feature that further defines the technical feature of the cited claim, or it can be an additional technical feature.

Necessary technical features: the technical features necessary to solve technical problems, the sum of which is enough to constitute the technical scheme of the invention or utility model.

Therefore, the technical features in the dependent claims are not necessary technical features, and the necessary technical features are embodied in the exclusive rights.