Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. MartinLogan -  MartinLogan is an American company producing conventional subwoofer speakers as well as floor-standing wall-mounted and in-wall hybrid speakers using electrostatic loudspeaker and planar magnetic thin film loudspeaker technology.
Company

Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. HMS B10 -  HMS B10 was a Royal Navy B class submarine built at Vickers Barrow-in-Furness launched 23 March 1906 and completed 28 April 1906. B10 was deployed to the Mediterranean soon after the outbreak of World War I. Due to the lack of spare parts this group of submarines were not used after September 1915. On 9 August 1916 B10 was sunk by aircraft of the Austrian Naval Air Service (Kaiserliche und Königliche Seeflugwesen) while under repair at Venice.
Mean Of Transportation

Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. TradeKing -  TradeKing is a privately held discount brokerage firm with headquarters in Fort Lauderdale Florida and subsidiary offices in Charlotte NC.
Company

Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. SJ Mg -  Mg is an electric locomotive used by Statens Järnvägar of Sweden for hauling freight trains. It was built in 17 copies by ASEA and was in service until 1980.The Mg-series was built for the electrification of Norra Stambanan in the 1940s. It was steeper and more curved than the main lines in Southern Sweden and single-track sections meant that long freight trains had to be used to make best use of line capacity. The D-series was not powerful enough and the Of-series was too long for the curves.
