Aquaprint Enterprises

The term "Light Patty" does not correspond to a standard, official Canon product or feature description. It is possible the user is referring to a specific component, an error indicator, or a colloquial term used in certain regions or repair contexts. 

A RISO Digital Duplicator is a high-speed, cost-effective printing device designed for large-volume duplication runs. It uses a unique master-making and drum-based printing process that is more economical than a traditional copier for long jobs, typically printing at speeds up to 190 pages per minute

A Xerox photocopy machine, or photocopier, is an electromechanical device that makes quick, high-quality copies of original documents using a process called xerography