Fanuc Corp., one of Japan's most reclusive companies, has spent decades building a wall of secrecy around its ultra-profitable industrial-robotics business.
Outsiders are rarely allowed at its complex in Yamanashi Prefecture on the slopes of Mount Fuji, where an army of yellow robots work 24/7 making more robots in windowless yellow factories.
Business is often done by fax to keep computer viruses out and technology in.