Manually-operated metal fluid valves, all for use in heating, ventilation, and air-conditioning (HVAC) systems

'air':15 'air-condit':14 'condit':16 'fluid':5 'heat':11 'hvac':17 'manual':2 'manually-oper':1 'metal':4 'oper':3 'system':18 'use':9 'valv':6 'ventil':12

Electrically-operated valves and automatic valves, all for use in heating, ventilation, and air-conditioning (HVAC) systems

'air':16 'air-condit':15 'automat':6 'condit':17 'electr':2 'electrically-oper':1 'heat':12 'hvac':18 'oper':3 'system':19 'use':10 'valv':4,7 'ventil':13

Mechanically-actuated valves, and valves being part of machines, all for use in heating, ventilation, and air-conditioning (HVAC) systems

'actuat':3 'air':19 'air-condit':18 'condit':20 'heat':15 'hvac':21 'machin':10 'mechan':2 'mechanically-actu':1 'part':8 'system':22 'use':13 'valv':4,6 'ventil':16

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