	eni unit agip petroli buys stake in u s company a subsidiary of state energy concern ente nazionali idrocarburi entn mi eni said it has uired a pct stake in steuart petroleum co an independent u s oil products company financial terms were not disclosed agip petroli spa said in a statement that the remaining pct of the u s firm is owned by steuart investment co a holding company which also has interests transportation hotels and insurance the italian firm said steuart petroleum operates primarily on the east coast of the u s reuter 
