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Keywords from Image Description:
rowell world war one worldwarone world war two worldwartwo gliding soaring lz lz graf zeppelin aviation aircraft airship dirigible lighter than air lighterthanair deutsche luftschiffahrtsaktiengesellschaft deutscheluftschiffahrtsaktiengesellschaft delag deutsche zeppelinreederei deutschezeppelinreederei dzr dlz dlz luftschiffbau