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US1200325A
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Method of regulating and proportioning the feed of dry or granular chemicals in water-mains.
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US1240325A
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Automatic controlling or regulating apparatus.
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US1178222A
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Hydraulic system or fluid-regulating device.
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US1211830A
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Automatic controlling or regulating apparatus.
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US1174243A
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Method of hydraulically controlling apparatus.
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US1174242A
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Fluid-controlling device.
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GB191208492A
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Improvements in or relating to Fluid Meters.
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US1212150A
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Fluid-metering system.
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US1212149A
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Fluid-metering system.
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US1200324A
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Regulating and proportioning the feed of chemicals or like substances to water or other fluids.
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