Nihon Denshin Denwa Kōsha. Musashino Denki Tsūshin Kenkyūjo

• Fakushimiri tsūshin hōshiki kōsei, fakushimiri chikuseki henkan sōchi hādowea, fakushimiri chikuseki henkan sōchi sofutowea, fakushimiri tsūshin ni okeru kōkan hōshiki
• Machigyōretsu sūhyō