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IEC 60994:1991 IEC 60994:1991 Guide for field measurement of vibrations and pulsations in hydraulic machines (turbines, storage pumps and pump-turbines)
IEC 61051-2:1991 IEC 61051-2:1991 Varistors for use in electronic equipment - Part 2: Sectional specification for surge suppression varistors
IEC 61051-2-2:1991 IEC 61051-2-2:1991 Varistors for use in electronic equipment - Part 2: Blank detail specification for zinc oxide surge suppression varistors. Assessment level E
IEC 60072-1:1991 IEC 60072-1:1991 Dimensions and output series for rotating electrical machines - Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080
IEC 60343:1991 IEC 60343:1991 Recommended test methods for determining the relative resistance of insulating materials to breakdown by surface discharges
IEC 60953-1:1990 IEC 60953-1:1990 Rules for steam turbine thermal acceptance tests. Part 1: Method A - High accuracy for large condensing steam turbines
IEC 60603-8:1991 IEC 60603-8:1991 Connectors for frequencies below 3 MHz for use with printed boards. Part 8: Two-part connectors for printed boards, for basic grid of 2.54 mm (0.1 in), with square male contacts of 0.63 mm x 0.63 mm
IEC 60721-2-6:1990 IEC 60721-2-6:1990 Classification of environmental conditions. Part 2: Environmental conditions appearing in nature. Earthquake vibration and shock
IEC 60721-1:1990 IEC 60721-1:1990 Classification of environmental conditions - Part 1: Environmental parameters and their severities
IEC 60748-11:1990 IEC 60748-11:1990 Semiconductor devices - Integrated circuits - Part 11: Sectional specification for semiconductor integrated circuits excluding hybrid circuits
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