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Low ripple coefficient voltage stabilizing circuit
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High-speed communication isolation circuit
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MBUS main node circuit with strong anti-interference capability
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Tin coating device
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Ammeter case connecting device and ammeter case
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Orderly power utilization management system and method for farmland drainage and irrigation platform area
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Welding device
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Method and device for predicting service life of electric energy meter
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Data compression method and device
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Columnar material extraction device
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Relay positioning testing device and relay testing equipment using same
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Function test system of external circuit breaker for cost control electric energy meter
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Electricity consumption information acquisition system, NB-IoT communication module and communication method thereof
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