Author
Denki Shikenjo (Japan)
2
Denki Tsūshin Kyōkai (Japan)
1
Hokkaidō Daigaku. Ōyō Denki Kenkyūjo
1
Kyūshū Daigaku. Shisutemu Jōhō Kagaku Kenkyūka
1
Nihon Denshin Denwa Kabushiki Kaisha
1
Nihon Denshin Denwa Kōsha. Shisetsukyoku
1
Sanʼyō Denki Kabushiki Kaisha. Gijutsu Honbu
1
Sanʼyō Denki Kabushiki Kaisha. Kenkyū Kaihatsu Honbu
1
Tōkyō Shibaura Denki Kabushiki Kaisha
1