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Zeppelin
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===Patents=== {{Refbegin}} * {{US patent|0621195}}, "Navigable balloon". 14 March 1899. Ferdinand Graf Zeppelin. * {{patent|US |1217657}}, "Method of destroying aircraft", Filed 11 April 1916. Joseph A. Steinmetz. * {{patent|US |1449721}}, "Light weight girder". Filed 28 June 1920. Karl Arnstein. * {{patent|US |1474517}}, "Airship". Filed 19 August 1922; Issued 20 November 1923. Julius Erhardt. * {{patent|US |1724009}}, "Rigid airship with separate gas cells". Filed 27 November 1922; Issued August 1929. Hugo Eckener. {{Refend}}
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