29According to the established case-law of the Court, although the last paragraph of Article 177 unreservedly requires national courts or tribunals against whose decisions there is no judicial remedy under national law to refer to the Court any question of interpretation raised before them, the authority of an interpretation provided by the Court under Article 177 may deprive that obligation of its purpose and thus empty it of its substance. This is especially so when the question raised is substantially the same as a question which has already been the subject of a preliminary ruling in a similar case (see, in particular, CILFIT and Lanificio di Gavardo, cited above, paragraph 13, and Joined Cases 28/62, 29/62 and 30/62 Da Costa en Scbaake and Others v Nederlandse BeLstingadministratie [1963] ECR 31). Such is also the case, a fortiori, when the question raised is substantially the same as a question which has already been the subject of a preliminary ruling in the same national proceedings.
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