An improved image building apparatus of the type including a platen roller and a recording head in which a recuired image is built on printing medium by transfering coloring agent on ink donor medium onto printing medium with the aid of the recording head which is activated in response to image information...http://www.google.fr/patents/US4702631?utm_source=gb-gplus-shareBrevet US4702631 - Thermal ribbon cassette and housing therefore
