Premise: The Santos-Dumont No. 6 was an airship designed and built by the Brazilian pioneer aviator Alberto Santos-Dumont. In 1901 it was used by him to win the Deutsch de la Meurthe prize for a return from Parc Saint Cloud to the Eiffel Tower and back. It is considered by many to be the first truly successful airship.
Hypothesis: The Santos-Dumont No. 6 was the only airship designed and built by the Brazilian pioneer