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Priority to ES115864UpriorityCriticalpatent/ES115864Y/en
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Publication of ES115864YpublicationCriticalpatent/ES115864Y/en
An improved ring essentially characterized by having a hard ball embedded under pressure at the free end of the shaft which establishes tangent contact with another hard ball held at the bottom of the rotation housing of that shaft. (Machine-translation by Google Translate, not legally binding)