TY  - BOOK
AU  - Smith, Sydney F.  
TI  - Telephony and telegraphy : introduction to instruments and switching systems(electromechanical and reed electronic)
SN  - 0-19-859357-0
U1  - 621.382 
PY  - 1978///
CY  - London
PB  - Oxford University Press
KW  - Communication engineering
KW  - Telecommunication
N1  - Includes index; na
ER  -