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Individual
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Individual
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Priority to ES21809ApriorityCriticalpatent/ES21809A3/en
Publication of ES21809A3publicationCriticalpatent/ES21809A3/en
ES21809A1897-11-261897-11-26
A phonograph or large pavilion or trumpet with a clockwork movement in which the auditory is suppressed.
ExpiredES21809A3
(en)
A mechanical teaching procedure called "Gramón" using transparent texts and light projections that can be combined with oral explanations or with the phonograph or similar devices.