Securement of heat exchange surfaces and method of making a joint between these surfaces
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Servo modulating regulating control system
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Securement of heat exchanger surfaces to tubes and method of fabrication
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Automatic flushing system for membrane separation machines such as reverse osmosis machines
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Temperature control of heat exchanger with bypass
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Means for coupling and sealing membrane carrying tube sections
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System to prevent freezing of heating units such as boilers
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Boiler for use with gaseous fuel or oil
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Water purification and vending apparatus
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Means for sealing membrane carrying tubes
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Reverse osmosis cell with turbulator means
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Water cleaning treatment
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Hot water heating system for providing hot rinse water at uniform temperature
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Valve control system
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Antifreeze boiler circuit
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Multiple pool system with common heater
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Multiple-boiler temperature control system having boiler sequencing, reverse order firing, and individual boiler modulation with outdoor temperature reset
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Stackless outdoor heater adapted for swimming pools
