Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IndividualfiledCriticalIndividual
Priority to ES21809ApriorityCriticalpatent/ES21809A3/es
Publication of ES21809A3publicationCriticalpatent/ES21809A3/es
ES21809A1897-11-261897-11-26Un fonógrafo o gran pabellón o trompeta con movimiento de relojería en el que quedan suprimidos los auditivos.
ExpiredES21809A3
(es)
Un procedimiento mecánico de enseñanza denominado "Gramón" valiéndose de textos transparentes y proyecciones luminosas que pueden combinarse con explicaciones orales o con el fonógrafo o aparatos similares.