International organization — European Coal and Steel Community — High Authority — General decisions of — Period within which decision can be annulled — Right to challenge validity of general decision when challenging individual decision made in application thereof.

International organization — European Coal and Steel Community — Convention containing Transitional Provisions, Section 29 — Scope of application of — Treaty establishing Community, Article 3 — Meaning of acts “in the common interest” — Article 59 — Scope of application of — Article 4 — Discrimination — Whether uniform subsidy system amounts to indirect grant prohibited by Article 4 — Relevance of interference with normal competition — Whether a violation of Treaty — Duty of High Authority to limit foreseeable Injury to third parties — Détournement de pouvoir — Relevance of aims of High Authority as published in Memoranda — Relevance of motive of avoiding administrative difficulties.