drives and black and white monitor/daisy wheel typewriter (DOS2) Teletype Corporation The Teletype Corporation, a part of American Telephone and Telegraph Company's Western Electric manufacturing arm since 1930, was founded in 1906 as the Morkrum Company. In 1925, a merger between Morkrum and Kleinschmidt Electric Company created the Morkrum-Kleinschmidt Company. The name was changed in December 1928 to Teletype Corporation. In 1930, Teletype Corporation was purchased by the American Telephone and Telegraph Company and became a subsidiary of Western Electric. In 1984, the divestiture of the Bell System resulted in the Teletype name and logo being replaced by the AT&T name and logo, eventually resulting in the brand being extinguished. The last vestiges of what had been the Teletype Corporation ceased in 1990, bringing to a close the dedicated teleprinter business. Despite its long-lasting trademark status, the word Teletype went into common generic usage in the news and telecommunications industries. Records of the United States Patent and Trademark Office indicate the trademark has expired and is considered dead. Teletype machines tended to be large, heavy, and extremely robust, capable of running non-stop for months at a time if properly lubricated. The Model 15 stands out as one of a few machines that remained in production for many years. It was introduced in 1930 and remained in production until 1963, a total of 33 years of continuous production. Very few complex machines can match that record. The production run was stretched somewhat by World War II—the Model 28 was scheduled to replace the Model 15 in the mid-1940s, but Teletype built so many factories to produce the Model 15 during World War II, it was more economical to continue mass production of the Model 15. The Model 15, in its receive only, no keyboard, version was the classic "news Teletype" for decades. Model 15 = Baudot version, 45 Baud, optional tape punch and reader Model 28 = Baudot version, 45-50-56-75 Baud, optional tape punch and reader Model 32 = small lightweight machine (cheap production) 45-50-56-75 Baud, optional tape punch and reader Model 33 = same as Model 32 but for 8 level ASCII-plus-parity-bit, used as computer terminal, optional tape punch and reader Model 35 = same as Model 28 but for 8 level ASCII-plus-parity-bit, used as heavy-duty computer terminal, optional tape punch and reader Model 37 = improved version of the Model 35, higher speeds up to 150 Baud, optional tape