The Circular loom was invented by Sakichi TOYODA, who is a founder of Toyota group, in 1906. Sakichi's targets were completion of the Automatic loom and the Circular loom. The Automatic loom was improved a hand loom to powered and high performance, but for hitting and moving a shuttle side to side when weaving a cloth, vibration and noise are big, and there is a lot of wastes power. So the Circular loom was born from the idea of “circular motion”, which uses the power ideally when weaving a cloth. The Circular loom was created by the original idea that was no reference example of a hand loom. There are also many creative mechanisms, so it's considered about the creativity.
Gas-insulated switchgear (GIS) has been widely applied since 1968 in Japan due to the compactness and high reliability, and has the brilliant history during this half century. This paper is the second report of GIS history following the first one which described the transition of technological development and practical application. The second report mainly deals with the wide spread and enlargement of GIS application from the middle of 1970s to the end of 1980s. First, progress of GIS construction such as three phase enclosed and combined GIS, and basic technologies which allowed these progress are mentioned. Secondly, downsized and improved performance of GIS equipment including GCB and MOSA are explained, and typical examples of GIS application which reflected these technical progress are introduced. Finally, the authors try to discuss the differences between domestic and overseas GIS technologies in terms of the downsizing process, and mention how these technologies and products in the second stage brought impacts on the next technologies and progress of GIS in 1990s.