An Etymological Dictionary of the German Language/Krahn
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Krahn, m., ‘crane’ (machine), ModHG. only, formed from LG. and Du.; prop. identical with Kranich, of which it is a shorter form; see Kranich. Gr. γέρανος also means ‘crane’; comp. too Lat. aries, HG. Bock, as well as Lat. grus, as terms for machines.