What is the predecessor of OPPO VIVO? Which one is BBK?

Oppo and vivo originally belonged to BBK Electronics, which was founded by Duan Yongping, the founder of Xiaobawang. Soon after the establishment of BBK Electronics Co., Ltd., the board was divided into three parts according to the company's business, namely BBK audio-visual electronics (predecessor of OPPO), BBK communication electronics (predecessor of vivo) and BBK education electronics. The three factories are relatively independent and can be said to be from different sources. After that, OPPO had to transform due to DVD copyright issues, and began to make MP3 and MP4. When the walkman market began to decline, OPPO transformed in time and began to enter the mobile phone market. And Vivo started as a phone. After being originally called BBK mobile phone, it began to intentionally weaken the BBK brand and focus on the vivo brand. However, after all, the two manufacturers belong to the same clan, more or less bearing the imprint of founder Duan Yongping, so we can understand why OPPO and vivo give people almost the same impression. But the two companies are completely independent and in a competitive state.