Keller, Karlheinz <br/><br/>
ITAPIS, a Documentation System on Patents for Photographic Chemistry, Materials and Processes 

<br/><br/><label>Subjects--Topical Terms: </label><br/>ITAPIS<br/>Patentwesen<br/>Dokumentation<br/>Patentdokumentation<br/>Patentsammlung<br/>Fotografie