Model # 502 Multi-Page Folder | US PATENT FOR SALE / FOR LICENSE TO MANUFACTURE. This includes Patent, Abstract, Engineering and Prototype unit ready for production. We have a copy of a letter from "Staples" requesting these machines. Abstract and Video Presentation Available Upon Request. What makes this different from other folding machines? All systems work from one motor. A stapling and gluing feature can be added so it is all done by one machine! Call Today