To provide a device capable of simultaneously opening/closing or designatively setting to open/close multiple windows of a building with the multiple windows by an opening/closing valve provided in a single place. 多数の窓を持つ、建物の窓を一箇所に設けた開閉バルブで建物多数の窓を一斉又は指定してセットし開閉できる装置を提供する。 - 特許庁