1. Technical Research Institute, Asanuma Corporation
2. Material Department, General Building Research Corporation of Japan
3. Engineering Department, Osaka Head Office, Takenaka Corporation
4. Technical Research Institute, Araigumi Co., Ltd.
5. Technical Research Institute, Matsumura-gumi Corporation
6. Tokyu Construction Co., Ltd.:(Present address)Ashikaga Institute of Technology
7. Osaka・Hyogo Ready-mixed Concrete Industry Association