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[[File:Duplex_Filter_01.gif|thumb|right|Duplex Filter]] | [[File:Duplex_Filter_01.gif|thumb|right|Duplex Filter]] | ||
[[File: | [[File:Duplex_Filter_02.jpg|thumb|right|Combination of Duplex Filter]] | ||
[[File: | [[File:Duplex_Filter_03.jpg|thumb|right|Parts of Duplex Filter]] | ||
'''Duplex filter''' is an assembly of two filters with valving for selection of either or both filters. | '''Duplex filter''' is an assembly of two filters with valving for selection of either or both filters. | ||