Screens being parts of oil well drilling and production machines; gas well screens being parts of gas well drilling and production machines; industrial screens being parts of filtration machines for liquid-solid and solid-solid separation

'drill':7,19 'filtrat':28 'gas':11,17 'industri':23 'liquid':32 'liquid-solid':31 'machin':10,22,29 'oil':5 'part':3,15,26 'product':9,21 'screen':1,13,24 'separ':38 'solid':33,36,37 'solid-solid':35 'well':6,12,18

Metal screens for oil, gas and water wells

'gas':5 'metal':1 'oil':4 'screen':2 'water':7 'well':8

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