Title: 風呂
Subjects: Water heaters, Patents, History, Bathtubs, Kenchiku setsubi-Rekishi, Jūtaku kenchiku-Rekishi, Hatsumei-Rekishi, Tokkyo-Rekishi, Kyūtō setsubi-Rekishi, Yokushitsu-Rekishi
Places: Japan
Time periods: 20th century