TY  - BOOK
TI  - A history of engineering and science in the bell system : switching technology (1925-1975) / 
SN  - 0932764029
U1  - 621.381537 
PY  - 1982///
CY  - Washington D. C.
PB  - Bell Telephone Laboratories, Inc., 
KW  - Engineering
KW  - History
KW  - Electronic circuits
KW  - Science history
N1  - Includes index
ER  -