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SAW GAGES-NAMELY, RIP GAGES AND MITER GAGES; PRESSURE CORRECTING GAS METERS; FLUID METERS-NAMELY, METERS FOR THE MEASUREMENT OF THE FLOW OF WATER, OILS, AND GREASES; CAST IRON, TIN AND STEEL GAS METERS AND STRAINERS; LARGE CAPACITY POSITIVE GAS METERS; DEMAND METERS; DOMESTIC AND CURB BOX METERS; COMBINED RECORD GAGES, METER PROVES AND TEST METERS; METER RECORDERS; CASH REGISTERS; FARE REGISTERS; TAXIMETERS; FLOW PROVERS-NAMELY, APPARATUS FOR TESTING AND CALIBRATING GAS METERS AT THEIR PROPER RATES OF FLOW; INDICATING FLOW METERS