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ParsevalBroschuere. ParsevalLuftschiff PL beim GordonBennetRennen in Zrich Broschuere der LuftfahrzeugGmbH Parseval aus dem Nachlass von Theodor Kiefer Chefingenieur bei Parseval ca anonymous anonymous published more than years ago ParsevalBroschuere GordonBennetRennen Zurich AnonymousEU Parseval airships Gordon Bennett Cup in