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advertising American Gas Institute ammonia amount Asso average believe Blackwell boiler burner Burt calorimeter candle power candle-power Cedar Rapids cent charge Clabaugh Clinton coal gas coal tar coke Commercial Gas Association commission committee condenser consumer cost council Crawford cubic feet Davenport District Gas Association Dubuque efficiency electric equipment expense fuel furnace G. I. Vincent gas appliances gas business gas company Gas Congress Gas Light gas plant gas range Genay give heating value holder increase industrial installed interest Iowa District Gas machine manager manufacture material meeting ment method Moines month necessary Omaha operation oven oxide pany paper pipe prepayment meter President pressure public utility purifying secretary sell small plant stove sumer tank temperature thing Thomas Crawford tion town valve water gas water heater