The typing and erasing device is applied to a printer of the daisywheel type and comprises a carrier (84, 86) for a typing ribbon (32) having a plurality of transverse tracks which can be selected for the printing operation and a carrier for an erasing ribbon which is disposed parallel to but at a different...http://www.google.fr/patents/US4601596?utm_source=gb-gplus-shareBrevet US4601596 - Typing and erasing device for printing machines
