It is said that he designed an innovative vehicle for his frail wife and that it was the first one called in Japanese jinrikisha, meaning a vehicle pulled by human power.
Konon, dia telah mendesain kendaraan unik bagi istrinya yang lemah fisik dan itu merupakan kendaraan pertama yang disebut dalam bahasa Jepang jinrikisha, artinya kendaraan yang ditarik manusia.