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Individual
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Individual
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Priority to ES281113ApriorityCriticalpatent/ES281113A3/en
Publication of ES281113A3publicationCriticalpatent/ES281113A3/en
Improvements in sketchbooks for teaching purposes, characterized by the fact that the notebooks are made by including some slate dispositions, preferably on the inside of the cover, apt to admit erasures, without leaving traces, in which they are made drawings according to some models that for this purpose are presented in the sheets of the notebook, whose sheets are located in a complementary manner with respect to said provisions, in order to facilitate the direct observation of those models during the execution of the corresponding drawing. (Machine-translation by Google Translate, not legally binding)
ES281113A1962-09-271962-09-27Improvements in the drawing books for didactic purposes (Machine-translation by Google Translate, not legally binding)
ExpiredES281113A3
(en)