First of all, Tony Gai, Tony Gai and Tony Inge are all transliterated from English, and nothing special is technology. One English can transliterate multiple words, so Tony Gai, Tony Gai and Tony Yinggai all have the same meaning. Although they all have the same meaning, according to the legal issues in China, they are held by various businesses in China. For example, Tony Inge belongs to an overseas company, and Tony Inge and Tony Inge are registered trademarks. Therefore, Tony Inge and Tony Iger do not belong to the same company, but the technology is the same, and there is no legal relationship between them.
Tonige Hairdressing School, with the same technology, but belonging to different companies and institutions, is economical and practical. Mainly famous for 15 hairstyle, while Tony Yinggai has 12 hairstyle, each with his own merits. You don't have to worry about these, just study hard.
Rest, I hope I can answer your questions.