Ėkhozagraditelʹnye ustroĭstva na seti͡akh svi͡azi
By: M. K. T͡Sybulin.
Publisher: Svi͡azʹ
Published: 1979
Place of publication: Moskva
Language: rus
Number of pages: 88
Subjects: Telephone -- Echo suppressors.
Notes: Bibliography: p. 86-[87]