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Individual
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Individual
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Priority to ES82980ApriorityCriticalpatent/ES82980A1/es
Publication of ES82980A1publicationCriticalpatent/ES82980A1/es
ES82980A1922-09-291922-09-29Un sistema o disposición para evitar choques en el ferrocarril y con el cual se mejoran servicios importantes.
ExpiredES82980A1
(es)