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the width and depth of the keyboard should be designed so that: a. keys used frequently are within easy reach; b. the upper arm does not need to be splayed out sideways; c. frequently used areas of the keyboard can be checked visually without moving the head.
Η διαφορά μεταξύ των δύο διαγραμμάτων δείχνει πως χρειάζεται ακόμη πολλή ερευνητική δουλειά.
