| http://www.w3.org/ns/prov#value | - as possible. [0164] Furthermore, as a method of notification to urge the maintenance, a notification or a warning is given by using a message or an image such as a picture or a mark used to urge the maintenance, the notification or the warning is given by using a buzzer, a speaker or the like, or an urgent notification is given to a portable terminal brought by an operator or a telephone in a mai
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