LIQUID AND GAS METERS, VENTURI TUBES, PITOT TUBES, INDICATING RATE GAUGES, RECORDING RATE GAUGES, COMBINATION RECORDING AND INDICATING RATE GAUGES, GAUGES FOR INDICATING AND RECORDING THE LOSS OF HEAD THROUGH A FILTER AND RATE OF FLOW OR BOTH, GAUGES INDICATING OR RECORDING RATE OF FLOW AND TOTALIZING THE FLOW, MANOMETERS, DEVICES FOR MEASURING CHEMICALS AND FEEDING THEM PROPORTIONATELY TO A FLOWING STREAM, AND PITOT RECORDERS

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