Image: Construction-pruss-opt-tele
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Description: Construction of prussian optical telegraph
Title: Construction-pruss-opt-tele
Credit: Hermann Kellenbenz: Die historische Bedeutung der Telegraphenstation in Köln-Flittard. In: Die Telegraphenstation Köln-Flittard. Eine kleine Geschichte der Nachrichtentechnik. Köln, 1973
Author: Unknown
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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