Metal tubes and pipes for transport, particularly of liquid gas or other types of gas

'gas':10,15 'liquid':9 'metal':1 'particular':7 'pipe':4 'transport':6 'tube':2 'type':13

Non-metallic rigid tubes and pipes for transport, particularly of liquid gas or other types of gas

'gas':13,18 'liquid':12 'metal':3 'non':2 'non-metal':1 'particular':10 'pipe':7 'rigid':4 'transport':9 'tube':5 'type':16

Non-metallic non-rigid tubes and pipes for transport, particularly of liquid gas or other types of gas

'gas':15,20 'liquid':14 'metal':3 'non':2,5 'non-metal':1 'non-rigid':4 'particular':12 'pipe':9 'rigid':6 'transport':11 'tube':7 'type':18

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