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I think if certain part has a patent, then it is illegal to make copy no matter with or without the trademark, since this is not only the copyright of the trademark, but it is also to prove that you have the ownership of the design of that certain product. I think of one example, like systema PTW system.  Please correct me if I am wrong.

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同意...就算比你做到個殼有咩用, 人地係講用料同做工...其實有時咁樣仲有marketing 既功效.