TY  - BOOK
AU  - Webb,John W.
TI  - Programmable logic controllers: principles and applications 
SN  - 002424970X
AV  - TJ223.P76 W43 1992
PY  - 1992///
CY  - New York
PB  - Maxwell Macmillan International
KW  - Programmable controllers
N1  - Includes bibliographical references (p. 373-374) and index
ER  -