In Japan, the launch of Lexus was complicated by Toyota's existing four domestic dealership networks at the time of its introduction.[42] The Toyota Crown and Toyota Century were exclusive to Toyota Store locations.[43] During the LS 400's development, local dealers' requests for a Japanese domestic market version had grown,[3] and a right-hand-drive Toyota Celsior-badged version was introduced shortly after the LS 400's U.S. debut, and introduced 9 October 1989 and only available at Toyopet Store locations.[44] The Celsior, named after the Latin word for "supreme", was largely identical to the LS.[44] Models came in either basic "A", upgraded suspension "B", or fully equipped "C" trim specifications.[45] The Crown and the Crown Majesta, which appeared later in 1991, were only available at Toyota Store locations which carried Japan-only Toyota luxury models, like the Century.[43] The Celsior introduced two world firsts: high-performance twin-tube shock absorbers and an air suspension combined with an upgraded version of Toyota's semi-active dampers Toyota Electronic Modulated Suspension, called Piezo TEMS.[46] This was ahead of its time: Mercedes-Benz first introduced a similar electronically controlled air suspension on the 1999 Mercedes-Benz S-Class (W220) (Airmatic).