Sendai hōdenkan o mochiita teikō yōsetsu sōchi no seigyo kairo ni  tsuite
By: Sumi Hanji, Okamoto Masaki, Igarashi Sadao.
Contributors: Okamoto, Masaki.; Igarashi, Sadao.; Mantetsu Tetsudō Gijutsu Kenkyūjo.
Series: Shiken hōkoku -- dai 226-gō; Shiken hōkoku (Mantetsu Tetsudō Gijutsu Kenkyūjo) -- dai 226-gō.
Publisher: Minami Manshū Tetsudō Kabushiki Kaisha Tetsudō Gijutsu Kenkyūjo
Published: 1942
Place of publication: Dairen-shi
Language: jpn
Number of pages: 10
Subjects: Electric circuit-breakers, Vacuum; Electric welding
Notes: Cover title.