An uninterruptible power supply system has standby and backup modes and can change to backup mode upon detection of a grid fault. The printhead includes an elongate mounting member defining a channel. In various embodiments: the encoded paging information comprises RDS paging activation codes; and the on-site commander is equipped with a computer operable to record status and arrival of fire companies. When the oil pressure is supplied by a normally open solenoid valve, and also a reverse gear stage switching mechanism is selected, a pilot pressure is supplied from a select position detection valve to a forcible reverse shift valve.