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Priority to ES1967133488UpriorityCriticalpatent/ES133488Y/en
Publication of ES133488UpublicationCriticalpatent/ES133488U/en
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Publication of ES133488YpublicationCriticalpatent/ES133488Y/en
Useful perfected writer, essentially characterized by comprising a tubular bushing inside which is rotatably mounted the body of the tool, which has numbers arranged in rows, the bushing being provided with windows and a numbering, thus, by causing the turning of the tool body, results of arithmetic operations can be obtained, at the same time making the numbering of the bushing coincide with those of the tool body, visible through the windows of the bushing. (Machine-translation by Google Translate, not legally binding)