Hōten-shō Gaihei-ken Sekkankin Sankōchi narabini Kaijō-ken Hachitakō-son Rōchōkō denki tankō chōsa hōkoku
Publisher: Mantetsu Chōsabu
Published: 1940
Place of publication: [Dairen]
Language: jpn
Number of pages: 14
Subjects: Electricity in mining
Notes: Cover title.

Confidential document (stamped).

"Ho 496; Chōshichō 52; Heishibun 320-37; In 50."