TY  - BOOK
AU  - Lehnert,Josef
TI  - Introduction to telegraph engineering
SN  - 0855012331 (paperback)
PY  - 1977///
CY  - [S.l.]
PB  - Siemens/Hayden
UR  - http://www.amazon.com/exec/obidos/ASIN/0855012331/chopaconline-20
ER  -