Most notable of Kaiba Corp's rivals is Schroeder Corp, headed by Zigfried von Schroeder. The Schroeder family has been rivals of the Kaibas ever since before Seto's time. They were also once a military dealer like Kaiba Corp. But when the past CEO went mad, Zigfried took power and changed the company to a games maker: as it would happen, this is the same time of Seto's rise to power, and the reformatting of his company to a game maker as well. Schroeder and Kaiba Corp both researched and developed holographic projection systems for Duel Monsters, but Seto's was patented and marketted first.
Meh~
Thought you might find this handy, love.
When Kahran does research... KAHRAN DOES RESEARCH!