TY  - BOOK
ED  - AMERICAN TELEPHONE AND TELEGRAPH COMPANY , NEWYORK
TI  - The Bell System Technical Journal , Volume 27 , 1948
U1  - 621.381 
PY  - 1948///
CY  - NEWYORK
PB  - AMERICAN TELEPHONE AND TELEGRAPH COMPANY
KW  - BELL SYSTEM , MECHANICAL ENGINEERING
ER  -