IS:4047 specification for heavy duty air break switches compo units of air break switches fuses for voltage not excess
Indian Standard Institute
IS:4047 specification for heavy duty air break switches compo units of air break switches fuses for voltage not excess - ISI 1967 - 22
IS:4047 specification for heavy duty air break switches compo units of air break switches fuses for voltage not excess - ISI 1967 - 22