makes eight models of grand piano from 155 cm to 290 cm in length (5'1" to 9'6") and two vertical pianos,120 cm and 130 cm in height (47" and 51"). The Imperial Grand is one of the world's largest pianos. Each numerical Bösendorfer model directly corresponds to its length in centimeters. For example, a Model 170 is 170 centimeters long (approximately 5'7"). The following tables describes the current Bösendorfer models: Grand pianos Current Grand Piano Models Upright pianos Current Upright Piano Models Conservatory Series To appeal to a wider market, Bösendorfer designed the Conservatory Series for colleges and universities that could not afford Bösendorfer's standard black-model pianos. The production of the two CS Series pianos spends less time in "non-critical areas", cutting down costs of production and purchase, making them more affordable than standard models. The cases and frames are of satin finish, rather than polished and, initially, the pianos were loop-strung rather than single-strung, but those practices have since been abandoned. Special and Limited editions Bösendorfer has produced a number of specially designed pianos named after famous composers such as Franz Schubert, Frédéric Chopin and Franz Liszt, as well as pianos designed for special occasions, such as Bösendorfer's 170th and 175th anniversaries. SE reproducing piano Under the ownership of Kimball, Bösendorfer built and sold a small number of 290SE automatic reproducing pianos. The 'SE' designation was for Stahnke Engineering, whose founder, Wayne Stahnke, invented the mechanism. The 290 was fitted with electronics and mechanics to record on magnetic tape and playback through electro-mechanical actuation of the piano. After the release of the Microsoft Windows v3.1 operating system, the 290SE could be attached to a PC computer for recording, editing and playback. The 290SE system was the first commercially available computer-controlled "player piano" capable of accurately reproducing both the notes and intensity of a performer's playing. This system was not further developed or patented due to its high cost. Competitors soon introduced patented reproducing piano technologies such as the Yamaha Disklavier in 1982. Thirty seven SE models were produced between 1984 and 1986, including the 225SE, the 275SE, and the 290SE Imperial model pianos. In the 290 range, this included some 290 to 290SE conversions, while one third of the production were 290SEs that sold for $90,000. The research that went into the 290SE later laid the foundation for the CEUS computerized reproducing piano system. Designer models Bösendorfer produces a