Jitsuyō denwagaku
By: Michida Teiji cho
Series: Nihon kōgaku zensho
Publisher: Kōgyō Tosho Kabushiki Kaisha
Published: 1937
Place of publication: Tōkyō
Language: jpn
Subjects: Telephone cables; Telephone relays
Notes: Vol. 2: 1942 printing.

Includes indexes.