DIN 48113:1973-09 Post insulators for switchgears and substation with nominal voltages greater than 1000 V; co-ordination of the definitions for mechanical bending strength
1973DIN 48113:1973-09 Post insulators for switchgears and substation with nominal voltages greater than 1000 V; co-ordination of the definitions for mechanical bending strength
1973DIN 48113:1973 Post insulators for switchgears and substation with nominal voltages greater than 1000 V; co-ordination of the definitions for mechanical bending strength