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Priority to ES0047396UpriorityCriticalpatent/ES47396Y/en
Publication of ES47396UpublicationCriticalpatent/ES47396U/en
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Publication of ES47396YpublicationCriticalpatent/ES47396Y/en
A luminous apparatus for optical illusion purposes, characterized in that it comprises a central mobile screen rotatable about its axis and advantageously cylindrical in a transparent material, on which a plurality of helical spirals in uniform opaque or translucent pattern have been represented, externally comprising this screen and concentric with it, another fixed screen, on which lines have been drawn in arbitrary directions and in dependence on a drawing, which is on an external screen. (Machine-translation by Google Translate, not legally binding)
ES0047396U1955-04-091955-04-09
Light fixture for optical illusion purposes
ExpiredES47396Y
(en)
A device to reveal directly in full light, validing the collection drum, the miniature radiographies of the photo-radioscopy equipment (Machine-translation by Google Translate, not legally binding)