TY - BOOK ED - Buraeu of Indian standards, New Delhi TI - Specification for porcelain bushings for alternating voltages up to and including 1000 V (first revision) (first reprint December 1997) PY - 1988/// CY - New Delhi PB - Buraeu of Indian standards, New Delhi KW - IS 7421 N1 - Indian Standard No. : IS 7421 ER -