| http://www.w3.org/ns/prov#value | - In the prior art liquid-level meter as described above, the mechanically operable electric contacts 5 to 7 are used and the slip rings 3 and brushes 13 are also required in order to detect the variation of torque acting on the drum shaft 2, these mechanical components i.e. contacts, slip rings and brushes, are liable to wear.
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