"The Graf Zeppelin (Deutsche Luftschiff Zeppelin #130; Registration: D-LZ 130) was the last of the German rigid airships built by Zeppelin Luftschiffbau during the period between ...
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the World Wars, the second and final ship of the Hindenburg class, and the second zeppelin to carry the name "Graf Zeppelin" (after the LZ 127) and thus often referred to as Graf Zeppelin II. Due to the United States refusal to export helium to Germany, the Graf Zeppelin II was filled with hydrogen and therefore never carried commercial passengers. It made 30 flights over 11 months in 1938–39, many being propaganda publicity flights; but staff of the Reich Air Ministry were aboard to conduct radio surveillance and measurements. The airship, along with its LZ 127 namesake were both scrapped in April 1940, and their duralumin framework salvaged to build aircraft for the Luftwaffe." - (en.wikipedia.org 14.05.2021)
