extern struct db_base db_tvrx1;
extern struct db_base db_tvrx2;
extern struct db_base db_tvrx3;
extern struct db_base db_dbsrx;
extern struct db_base db_tvrx1;
extern struct db_base db_tvrx2;
extern struct db_base db_tvrx3;
extern struct db_base db_dbsrx;