TY  - BOOK
AU  - Hobbs,Marvin
TI  - Modern communications switching systems
SN  - 0830646787
PY  - 1974///
CY  - Blue Ridge Summit, Pa.
PB  - G/L Tab Books
KW  - Telephone, Automatic
KW  - Telephone switching systems, Electronic
KW  - Electric switchgear
ER  -