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Keywords from Image Description:
Codebookprussiantelegraph. st page of prussian telegraph's codebook for opticaltelegraphy Hans Pieper Aus der Geschichte der Nachrichtentechnik von der Antike bis zur Gegenwart unter besonderer Bercksichtigung der optischen Telegraphie in Frankreich und Preuen In Die Telegraphenstation KlnFlittard Eine kleine Geschichte der Nachrichtentechnik