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Priority to ES0176754ApriorityCriticalpatent/ES176754A2/es
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Certificado de adición a la patente principal de invención número 175.582 la extensión para las exteriorizaciones acústicas de los distintos modos sonoros conocidos similares a los discos fonográficos entre ellos la cinta magnética amplificado o no el sonido mediante altavoces o micrófonos.
ES0176754A1947-02-101947-02-10MEJORA EN LA PATENTE NuMERO 175582
ExpiredES176754A2
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