56Moreover, it is for the national court or tribunal alone to decide at what stage in the proceedings it is appropriate to refer a question to the Court of Justice for a preliminary ruling (see, to that effect, judgment of 17 July 2008, Coleman, C‑303/06, EU:C:2008:415, paragraph 29 and the case-law cited), with the latter having no jurisdiction, however, to hear a reference for a preliminary ruling when, at the time it is made, the procedure before the referring court or tribunal has already been concluded (judgment of 13 April 2000, Lehtonen and Castors Braine, C‑176/96, EU:C:2000:201, paragraph 19).
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