IEC 60468:1974

Method of measurement of resistivity of metallic materials

IEC 60377-1:1973

Methods for the determination of the dielectric properties of insulating materials at frequencies above 300 MHz. Part 1: General

IEC 60428:1973

Standard cells

IEC 60394-2:1972

Varnished fabrics for electrical purposes. Part 2: Methods of test

IEC 60258:1968

Direct acting recording electrical measuring instruments and their accessories