Cristiano Corti had a web site at www.flipper.cjb.net with company and game history for Zaccaria and MR Game pinball machines, including flier scans for most of their solid state games. The text is in Italian, but Google's translate does a passable job of converting the pages to English. I have posted English translations (with permission) of Cristiano's Zaccaria and MR Game pages here.