G PHYSICS
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G01 MEASURING; TESTING
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G01F MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
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1/00 Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
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G01F1/05 by using mechanical effects
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G01F1/34 by measuring pressure or differential pressure
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G01F1/36 the pressure or differential pressure being created by the use of flow constriction
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G01F1/40 Details of construction of the flow constriction devices
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G01F1/44 Venturi tubes
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