
Direct Acting Indicating Analogue Electrical Measuring Instruments And Their Accessories - Part 5: Special Requirements For Phase Meters, Power Factor Meters And Synchroscopes
出版:Standardiserings-Kommissionen I Sverige

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Direct Acting Indicating Analogue Electrical Measuring Instruments And Their Accessories - Part 5: Special Requirements For Phase Meters, Power Factor Meters And Synchroscopes
出版:Standardiserings-Kommissionen I Sverige
專家解讀視頻