Technical requirements for acoustic couplers
By: Nippon Telegraph & Telephone Public Corporation.
Contributors: Nihon Denshin Denwa Kōsha. Shisetsukyoku.
Series: NTT technical requirements
Publisher: Telecommunications Association, Shōwa 55
Published: 1980
Place of publication: Tokyo, Japan
Language: eng
Subjects: Telephone -- Specifications -- Japan.; Data transmission systems -- Specifications -- Japan.
Notes: Cover title.
"Translated from the Technical Requirement based on NTT Public Notice no. 151, 1972"--Verso of cover.
In colophon: Prepared by Nihon Denshin Denwa Kōsha Shisetsukyoku.