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Class Information
Number: 400/489
Name: Typewriting machines > Key-board or key lever-actuating mechanism > Key-board including keys grouped to facilitate positioning of typist's fingers
Description: Subject matter wherein significance is attributed to the positioning of the key* elements of a key-board* in accordance with the distance that the fingers of a typist needs to reach from a rest position of the typist"s hands to pressing position of the typist"s fingers on the key element to be pressed.










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