The present invention is a fully functional hand held computer having a see through display. An external viewing arrangement, such as a monocular scope, is used to view the operator's immediate surroundings. Optical images from the scope are superimposed with digital images from a miniature computer...http://www.google.com.au/patents/US6597346?utm_source=gb-gplus-sharePatent US6597346 - Hand held computer with see-through display
