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IEC 60444-1 Amd.1 Ed. 2.0 b:1999
Amendment 1 - Measurement of quartz crystal unit parameters by zero phase technique in a pi-network. Part 1: Basic method for the measurement of resonance frequency and resonance resistance of quartz crystal units by zero phase technique in a pi-networkAmendment by International Electrotechnical Commission, 08/13/1999
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