(under subclass 4) Device which includes a modification adapted to simplify or reduce the number of operations required to effect the cancellation of a portion of the series of perforations made in previous cycles of the machine.
(1) Note. Such a device usually operates in two general steps: (1) to restore the justification counter and indicator to the conditions they occupied prior to the punching of the canceled subject matter; and (2) to overpunch the matter to be canceled, or to insert an error symbol in appropriate position to be sensed by the type-casting machine for which the tape is intended to be used.
