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Priority to ES0053991UpriorityCriticalpatent/ES53991Y/en
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Twin glasses perfected, characterized by being composed of two fixed optical tubes, joined to a hollow body closed at the bottom, forming the set of these three elements in one piece, which is closed at the top by a bridge with two holes laterals coaxial with the theoretical axis of the two fixed tubes, through whose orifices pass two sliding eye tubes provided with their corresponding lenses, which are operated, for telescopic sliding, by means of internal threaded elements. (Machine-translation by Google Translate, not legally binding)