TY  - BOOK
AU  - Bureau of Indian Standards
TI  - IS: 9921 (Part 4) - 1985 Reaffirmed 1992; Specification for alternating current disconnectors (isolators) and earthing switches for voltages above 1 000V Part 4 type tests and routine tests
PY  - 1985///
CY  - New Delhi
PB  - BIS
ER  -