MACHINES FOR USE IN THE MANUFACTURE OF HELICALLY FORMED METAL TUBING, DUCTING, [ FLOW CONTROL VALVES AND MIXING VALVES, AND PARTS THEREOF; VALVES FOR USE AS PARTS OF MACHINES ]

'control':14 'duct':12 'flow':13 'form':9 'helic':8 'machin':1,28 'manufactur':6 'metal':10 'mix':17 'part':20,26 'thereof':21 'tube':11 'use':3,24 'valv':15,18,22

[TUBES, TUBING, DUCTS, DUCTING, [ FLOW CONTROL VALVES, AND GAS MIXING VALVES ] ALL FOR USE IN AIR-CONDITIONING, WARM-AIR HEATING, AND EXHAUST SYSTEMS; AND PARTS THEREOF]

'air':17,21 'air-condit':16 'condit':18 'control':6 'duct':3,4 'exhaust':24 'flow':5 'gas':9 'heat':22 'mix':10 'part':27 'system':25 'thereof':28 'tube':1,2 'use':14 'valv':7,11 'warm':20 'warm-air':19

[TUBES, TUBING, DUCTS, DUCTING ALL MADE OUT OF METAL, AND PARTS THEREOF; MANUAL VALVES MADE OUT OF METAL ]

'duct':3,4 'made':6,15 'manual':13 'metal':9,18 'part':11 'thereof':12 'tube':1,2 'valv':14

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