36Concerning the issue whether the operation of assembling various parts amounts to a substantial working or processing operation, the Court has already held that such an operation may be regarded as conferring origin where it represents, from a technical point of view and having regard to the definition of the goods in question, the decisive production stage during which the use to which the component parts are to be put becomes definite and the goods in question are given their specific qualities (Case 114/78 Yoshida [1979] ECR 151 and Brother International, paragraph 19).
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