INTERLOCUTORY PROCEEDINGS - POWERS OF JUDGE RESPONSIBLE FOR GRANTING INTERIM RELIEF - JURISDICTION TO SUSPEND OR DEROGATE FROM A GENERAL DECISION - LIMITS INTERLOCUTORY PROCEEDINGS - INTERIM MEASURES - CONDITIONS FOR GRANT - DIRECT LINK WITH THE DECISION AT ISSUE IN THE MAIN ACTION ( ECSC TREATY , ART . 39 ; RULES OF PROCEDURE , ART . 83 ( 2 ))