Recently, for about 20 years, museums and art-museums have contributed greatly to the social education in Japan. Especially, we have obtaind great success, in cultural movements in local districts. In recent years, many researches concerning ancient ruins have had remarkable success, and we have got a high reputation for our success in archaeology. We had exhibit many archaeological materials and goods, but we did not have any ideal glass for exhibition cases. Moreover, many art-museums had to be built in the local cities and towns. So we need huge volume of non colored glass and non reflecting glass for the exhibition cases in the museums and art-museums. We succeeded in developing ideal glass for exhibition cases. This glass is now used widely in Japan and worldwide
