TY  - BOOK
ED  - AMERICAN TELEPHONE AND TELEGRAPH COMPANY
TI  - The Bell System Technical Journal VOL.34 Jan-Dec, 1955
U1  - 621.381 
PY  - 1955///
CY  - NEWYORK
PB  - AMERICAN TELEPHONE AND TELEGRAPH COMPANY
KW  -  TELEGRAPH
KW  -  TELEPHONE
KW  - BELL SYSTEM
ER  -