Patentdaten der Deutschen Demokratischen Republik (DDR) (1949-1990)
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https://b2find.eudat.eu/dataset/08683751-4428-5835-b06c-948759ac4d05
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资源简介：
The database contains all patents granted in the GDR and published by the Office of Inventions and Patents (AfEP, later: German Patent and Trade Mark Office/DPMA) in the period...
