Nihon Denshi Kikai Kōgyōkai. Chōsabu

• Sangyōyō denshi kiki yushutsuʼnyū jissekihyō
• Shōwa 60-nen 4-gatsu denshi kiki seisan jissekihyō
• Shōwa 60-nen 5-gatsu denshi kōgyō yushutsunyū jissekihyō