The company headed by Masayoshi Son worked with the development of what robot?
SoftBank Group: SoftBank Group Corp. (ソフトバンクグループ株式会社 , Sofutobanku Gurūpu Kabushiki-gaisha ) is a Japanese multinational telecommunications and Internet corporation established on September 3, 1981, and headquartered in Tokyo, Japan. SoftBank Group:  The company is headed by founder Masayoshi Son.
i don't know