The late Naoharu Yamashina, founder of toy manufacturer Bandai Co., the maker of the popular electronic pet Tamagotchi, left behind an estate worth 2.65 billion yen when he died last October at age 79, Tokyo's Shinagawa Taxation Bureau said Monday.Savings and stocks make up the core of the inheritance left to four heirs, including his widow and son, Makoto, currently Bandai's chairman. Inheritance taxes will amount to about 680 million yen.Yamashina was born in Kanazawa, Ishikawa Prefecture, and founded Bandai's predecessor, Bandaiya, in 1950. While president and chairman of Bandai, Yamashina also acted as chairman of the Japan Toy Association.