A milling tool for enlarging portions of a wellbore. After the hardening of the forming mass, the retort cylinder and the charging body are removed from the forming mass, thereby leaving behind a retort. In another respect, embodiments of the invention enable more accurate economic valuations of electronic advertisements. In which, a device of the plurality of devices is specified to receive notifications over the first network connection of data received by the at least one of the plurality of portable electronic devices, so that notifications indicating data received by the plurality of portable electronic devices are sent to the specified portable electronic device. The first damper member and the second clamper member are coupled with each other by a bolt and include abutting faces for abutting with each other so as to receive an axial force of the bolt.