A square black microammeter (year 1963) for 150 microampere of direct current premium vector by Serhiishyian

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object number graphic illustration design shape closeup equipment ampere current electric electrical electricity hardware industrial technology volt voltage old retro square instrument symbol icon device electronics flat data measuring measure measurement test letter scale information obsolete pointer engineering meter control direct analogue circuit indicator plastics regulation tester ammeter 1963 microammeter

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