" 
 :The article should make this clearer, but it is explained in the text.  The company name was originally DAT Automobile Manufacturing Co., then just Automobile Manufacturing Co. in 1933, then Nissan Motor Co. Ltd. in 1934. 
 :Datsun was the name of DAT's first product (and thus Nissan Automobile's first product); the name Datsun survived outside Japan as the brand name of Nissan's entire automobile lineup until 1982 (however the name of the company remained Nissan Motor Co. Ltd.). —   "