designed works that created the Olivetti image and became emblematic Italian reference in the history of 20th-century design. Those designers also created the Olivetti Synthesis office furniture series which mainly were used to be installed in the firm's own headquarters, worldwide branch offices and showrooms. Olivetti also produced some industrial production machinery, including metalworking machines of the Horizon series. Typewriters Olivetti began with mechanical typewriters when the company was founded in 1909, and produced them until the mid-1990s. Until the mid-1960s, they were fully mechanical, and models such as the portable Olivetti Valentine were designed by Ettore Sottsass. With the Tekne/Editor series and Praxis 48, some of the first electromechanical typewriters were introduced. The Editor series was used for speed typing championship competition. The Editor 5 from 1969 was the top model of that series, with proportional spacing and the ability to support justified text borders. In 1972 the electromechanical typeball machines of the Lexicon 90 to 94C series were introduced, as competitors to the IBM Selectric typewriters, the top model 94c supported proportional spacing and justified text borders like the Editor 5, as well as lift-off correction. In 1978 Olivetti was one of the first manufacturers to introduce electronic daisywheel printer-based word processing machines, called TES 401 and TES 501. Later the ET series typewriters without (or with) LCD and different levels of text editing capabilities were popular in offices. Models in that line were ET 121, ET 201, ET 221, ET 225, ET 231, ET 351, ET 109, ET 110, ET 111, ET 112, ET 115, ET 116, ET 2000, ET 2100, ET 2200, ET 2250, ET 2300, Et 2400 and ET 2500. For home users in 1982 the Praxis 35, Praxis 40 and 45D were some of the first portable electronic typewriters. Later, Olivetti added the Praxis 20, ET Compact 50, ET Compact 60, ET Compact 70, ET Compact 65/66, the ET Personal series and Linea 101. The top models were 8 lines LCD based portables like Top 100 and Studio 801, with the possibility to save the text to a 3.5-inch floppy disk. The professional line was upgraded with the ETV series video typewriters based on CP/M operating system, ETV 240, ETV 250, ETV 300, ETV 350 and later MS-DOS operating system based ETV 260, ETV 500, ETV 2700, ETV 2900, ETV 4000s word processing systems having floppy drives or hard disks. Some of them (ETV