Process and apparatus for duplicating on microfiche the intelligence appearing on a photoplastic microfiche master by irradiating the duplicate through the master with high intensity moderately collimated light. Photoplastic film having a relatively thick thermoplastic layer is used as the master. The...http://www.google.com.au/patents/US4147429?utm_source=gb-gplus-sharePatent US4147429 - Apparatus and process for photographically duplicating intelligence existing on photoplastic film
