A process for substantially decreasing fouling in a refinery unit. The motor is arranged on one side of a vehicle center line oriented in a longitudinal direction of the vehicle and the battery is arranged on an opposite side of the vehicle center line and around the storage box. The first contacting portion extends in a first direction. Upon the reception of the message or voice calling from another member, the terminal device 12 instructs the aroma emitting adapter 13 to emit the aroma and the aroma emitting adapter 13 thus emits aroma by releasing the aroma liquid contained in the aroma cartridge 14. The breast pump provides fluid isolation between the pressure source and the expressed milk. In a first state in which a sheet cassette is not attached to the housing, a cover member seals an opening portion formed in the second wall portion and through which the sheet cassette passes through, and forms part of the second wall portion.