A deceleration control device for a vehicle including an automatic transmission capable of changing the gear ratio by a shift operation of a driver. The mission chamber 52 houses a transmission gear mechanism. As the cleaning fixture advances from the retracted position to the extended position, foreign debris present in the discharge passageway is displaced and ejected out of the discharge orifice. The non-condensed parts of the exhaust gas are bled off, whereby the condensation of the working fluid, the bleeding off of non-condensed residual gases, the depressurisation of the working fluid condensate and the evaporation of the condensed working fluid are carried out in a residual gas separator. Servo fields are written through the head along an arc at the defined radial location on the disk. Multiple nodes are typically sent a multicast message, which includes an indication of one or more designated nodes to acknowledge the message, a sequence number or other message identification value, and possibly an indication whether an immediate or delayed acknowledgment is requested.