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    • Qualified to confirm the certificate
    • Measurement guarantee confirmation certificate
    • Computer element analyzer patent certificate
    • Photoelectric direct reading spectrometer patent certificate
    • Before the furnace hot metal silicon carbon analyzer patent certificate
    • Trace element infrared analyzer patent certificate
    • High frequency infrared carbon sulfur analyzer "copyright"
    • Spectrometer patent certificate
    • High frequency infrared carbon sulfur analyzer patent certificate
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