Before today's console wars and mobile gaming, the landscape was shaped by pioneers in the physical world. One of the true titans was International Game Technology (IGT) 
https://en.wikipedia.org/wiki/International_Game_Technology_(1975%E2%80%932015). From its start in 1975, IGT didn't just make games; it defined an entire era of electronic gaming, especially in casinos. They were the masters behind the classic, standalone video slots that became iconic. It's a great reminder of how foundational companies like IGT built the tech and excitement that still drives the broader gaming industry today.