ES8816U - Dispositivo electrográfico sonoro y luminoso aplicado a mapas murales geográficos, cuadros anatómicos y otros gráficos para estudio escolar.
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Dispositivo electrográfico sonoro y luminoso aplicado a mapas murales geográficos, cuadros anatómicos y otros gráficos para estudio escolar.
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Un nuevo dispositivo electrográfico laminoso y sonoro aplicable a toda clase de mapas geográficos murales, cuadros de anatomía y fisiología y a toda clase de gráficos destinados a la enseñanza escolar, sea en plano o en relieve.
ES0008816U1943-06-301943-06-30Dispositivo electrográfico sonoro y luminoso aplicado a mapas murales geográficos, cuadros anatómicos y otros gráficos para estudio escolar.
ExpiredES8816Y
(es)
Some effects of school broadcasts in literature: an evaluation of certain educational outocmes of radio literature programs used in seventh-and eighth-grade classes in Chicago public schools