Commission Regulation (EEC) No 2192/93 of 28 July 1993 concerning certain operative events for the agricultural conversion rates used in the wine sector and amending Regulations (EEC) No 1059/93, (EEC) No 377/93, (EEC) No 2729/88, (EEC) No 2253/92, (EEC) No 3233/92 and (EEC) No 3234/92.