1930 ministerial ordinance by the Japanese government declared that drivers' licenses would not be required for cars with engines up to 500 cc displacement, and that the purchase of these vehicles would be taxed at a lower rate. DAT began to produce a small car for this market. The new car was called "Datson"(i.e. "Son of DAT") and later "Datsun" to distinguish it from the full-sized trucks and cars the company had produced in the past. Datsun Type 10 – 17 Type 10 In 1929, DAT built a small-car prototype called the DAT 91. They ended up marketing this model as the DATSON Type 10 ("son of DAT"), since it was a shrunken version of the earlier 31. "DAT" was now a backronym for Durable, Attractive, and Trustworthy. The car fit into a new category of small cars, limited to half a liter's displacement. The production version was powered by DAT's own four-cylinder, side-valve engine of 495 cc. It (and the inauspicious "DATSON" name, with "son" being close to 損, the Japanese word for "loss") was replaced by the Datsun Type 11 in 1932. Types 11 – 14 The 1932 Datsun Type 11 was a small car with a 495 cc, 10 HP side valve engine and a three speed transmission. [JSAE]. It was offered in several body styles, and DAT/Nissan sold 150 of the Type 11 in 1932. [JSAE] The Type 11 was only produced during the year 1932, as changes in the law allowed Nissan to sell a new model with a larger engine in 1933. 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