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Should the specific model be written in the patent claim for utility model? Is it still within the scope of patent protection to make a slight change?

If it is not this type of material or component, you can write.

If only this kind of material or component is a better choice, but it is not the only choice, then the claim should not be mentioned, otherwise the scope of protection will be narrowed. It is suggested that the description should be properly described in the upper level to expand the scope of protection.

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