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  "abstract": "Holding device for magnetically mounting a contact sensor on a curved magnetic surface, for example on a pipeline or on a housing of a bearing, comprising at least two movable pole shoes having the same poling and, in the neighbourhood thereof, a plunger-like pole shoe with opposite poling. The plunger-like pole shoe is displaceable relative to the other pole shoes and the magnets and, upon contacting of the holding device is displaced towards the mounting surface by the magnetic force.",
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