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Portable potential difference meter
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Improvement on UJ33a type portable potential difference meter
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Three-range portable potential difference meter
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DC potentiometer with seven stepping discs
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Potentiometer with seven stepping discs
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Potentiometer with six stepping discs
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Single-arm and double-arm bridge
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Single-double-arm bridge
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Dual-purpose instrument for double-arm bridge and potential difference meter
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Single arm electric bridge and potentiometer dual purpose meter
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Double-arm bridge
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Double-arm bridge
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Voltage-measuring device with four measuring panels
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