32In this connection, it must be noted that the assembling of the keypad membrane at issue in the main proceedings with the other components of a mobile telephone serves to ensure that it is a functional unit. The term ‘functional unit’, as defined by the case-law of the Court, applies where a machine or appliance consists of separate components which are designed to contribute together to a single clearly defined function (Case 223/84 Telefunken Fernseh und Rundfunk [1985] ECR 3335, paragraph 29).
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