This is what I've recently discovered via the Wayback Machine at web.archive.org: A Mr. Ray Grossman posted in 2001 in the comments after the Meridian 45B article on the Large Format Page that he was the son of one of the principles of the Meridian Instrument Co. He said he owned the only prototype 45C in existence, and that he collected Meridians. Does anyone know if he's still around?