Judgment of the Court; 13 November 1979; Sanicentral GmbH v René Collin; in Case 25/79:

Articles 17 and 54 of the Convention of Brussels of 27 September 1968 on Jurisdiction and the Enforcement of Judgments in Civil and Commercial Matters must be interpreted to mean that, in judicial proceedings instituted after the coming into force of the Convention, clauses conferring jurisdiction included in contracts of employment concluded prior to that date must be considered valid even in cases in which they would have been regarded as void under the national law in force at the time when the contract was entered into.