A method of washing an object using a pressurized water source includes combining a cleaning fluid and the pressurized water and diffusing pressurized air into the combined cleaning fluid and pressurized water. Said method is characterized in that the communication network comprises a plurality of virtual local area networks, to each of which at least one network transition between the communication network and another network is allocated, while said connection is assigned to a virtual local area network based on an operator selection code when a connection is established. In some embodiments, the offset is used to correct signal processing calculations that rely on assumptions about the acoustic center of each transducer in the transducer array. Treating physicians have access to each patient’s records for review and update. Restricted stops are formed at the open ends of the through holes for abutting the enlarged inner ends of the contact members to define outer limit positions of the pressure contacting end portions of the contact members.