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The history of the lighter than air ship is an interesting one. The first person to make such crafts popular was a Count Ferdinand von Zeppelin who in 1900 built the first design of a rigidly framed airship to be put to practical use. Yet he wasn't the first man to create such a craft, and definitely wasn't the first to make the attempt.
So your challenge is this - have someone, be they an individual, group of people, country, or company create a mass producible design for a rigid, or semi-rigid, aircraft before 1890. GO!