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Some documents that need a copy (copy on carbon paper) are created using carbon paper between several inserted sheets of paper. After each key press (including spacebar), movement of the paper holder with the roller is activated by one writing step to the left. The machine is pulled by a spring, which the user pulls back when the lever is brought back upstream. At the same time, the roller is rotated in one step using the line switch (lever on the left side of the bar). These movements are performed manually by the user, which also includes switching from lower case to upper case, whereby the entire lower case is raised to the writing position in front of the respective type of lettering. .
In electromechanical typewriters, the movement of the key levers is supported by an electric motor; In electronically controlled typewriters, the keys instead of the main lever act only as a trigger (switch). Selection of the printing type and the stop is done by the electric motor. The electrification of the typewriter has encouraged the use of new type devices as variations of the type lever.
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