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| four patents of tower flowmeter 2009-9-22 |
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V AWL FLOWMETER PATENT CERT OF MULTIAPERTURE PRESSURE ACQUIREMENT V AWL FLOWMETER PATENT CERT OF ANTI STICKING MATERIAL COAT
V AWL FLOWMETER PATENT CERT OF HEATING THE THROTTLING ELEMENT
V AWL FLOWMETER PATENT CERT OF INTEGRATIVE TEMPRETURE AND PRESSURE COMPENSATION |
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