Tankō hoan kitei no tsukurikata
Subtitle: tsuketari hoan iinkai no tsukurikata
By: Kōzan Hoankyoku kanshū ; Tankō Hoan Kondankai, Nihon Skitan Kyōkai kyōhen
Publisher: Nichieisha
Published: 1949
Place of publication: Tōkyō
Language: jpn
Number of pages: 322
Subjects: Coal mines and mining; Safety regulations