witha medium llbare bef and professional;or entleerbare bladder, and the bladder through the mediumbef & professional llung respectively;- emptying at least one of its mass or dimensionsfor example, the thickness of & auml; look at.with at least a measuring device m & t.; r recording a value of thisdimension or measure is provided, and the measuring device fromat least one sensor and a sensor cooperating with thereference is formed, characterized by the fact that the sensoras the reference to or in the blasenhaut bladder arranged.
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