(under subclass 90) Subject matter for converting digital signals to or from other digital signals which are coded in Hollerith code.
(1) Note. Hollerith code is used on IBM punched cards where each character on the card is represented by holes in a vertical column. There are eighty vertical columns each having twelve possible hole positions. In accordance with the Hollerith code characters are represented one, two, or three holes in particular positions in the vertical columns.