The Datsun Type 11 had the same engine displacement and external dimensions as an Austin Seven, and information about the British car was widely available within Japan. In October and November 1929, the chief engineer of Austin presented a paper in Tokyo called "The British Light Car". This paper is supposed to have provided detailed explanations and illustrations of many of the mechanical components of the Austin Seven. The exact relationship between the two cars is, however, in dispute. Some authors say that it was a licensed copy of the Seven. Others insist it was a copy, but not an authorized one. Herbert Austin was definitely concerned about the possibility of the Datsun infringing on his patents; he subsequently imported a 1935 Datsun to examine, but decided not to file a complaint. Some websites have pointed to this as evidence supporting the hypothesis that the Datsun was not a copy of the Austin. Other websites have pointed out that the decision to not press charges might have been because that by then the Datsun designs had begun to differ from those of the Austin.