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Individual
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Individual
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Priority to ES0316884ApriorityCriticalpatent/ES316884A1/en
Publication of ES316884A1publicationCriticalpatent/ES316884A1/en
System of acoustic signals for navigation, characterized in that one is serious and the other acute, synchronized, operating at the same time and in equal periods of time. (Machine-translation by Google Translate, not legally binding)
ES0316884A1965-08-271965-08-27System of acoustic signals for navigation. (Machine-translation by Google Translate, not legally binding)
ExpiredES316884A1
(en)