A method for managing an in-vehicle messaging service in a vehicle corresponding to a subscriber of the in-vehicle messaging service. The upturned ends of the holders are positioned flush against the end of the mattress when retracted. The wind-off device places the length of fabric directly onto the conveyor belt or onto one of more lengths of fabric already deposited on the said conveyor belt. On the other hand, when the potential of the signal obtained from the received radiowave is lower than the output potential of the battery, power produced by the battery is used as power to drive the radio field intensity measurement device. 5%; 0%\u2266Ni\u22665%; 0%\u2266Cr\u22665%; 0%\u2266Mo\u22661%; 0%\u2266W\u22662%; 0.