... industrial oils,fluid filtration,hydraulic,lubrication system.(C),The air filter cartridges,oil filter cartridges,oil-gas separation filters ... diesel fuel filters etc. used in air compressors,generator sets,air blower etc.(D),Air filters,engine oil filters,oil filters, ... .(G),Primary,medium and efficiency filters used in the central air conditions, wind supplementary machines.(F),Gas filter of the ...