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  • Photoelectric keyboards are known from DE-PS 15 61 211, where for the input of symbols, such as characters or numbers, generally each key has assigned to it masks in the form, for example, of a slide or a coding template, which, as a key is being depressed, is moved into the path of light tracks extending between a light source and photo-elements, e.g. photo diodes, photo transistors, etc., whereb
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