
1) Befools 2) Cons 3) Gulls 4) Has 5) Patsies 6) Pigeons 7) Repros 8) Saps 9) Snookers 10) Suckers 11) Takes in 12) Uses
Found on
https://www.crosswordclues.com/clue/dupes

1) Cheats 2) Con targets 3) Deceives 4) Easy marks 5) Easy targets 6) Fools 7) Gullible guys 8) Gullible saps 9) Gullible sorts 10) Gulls 11) Hoodwinks 12) Makes a fool of 13) Marks 14) Patsies 15) Plays for a patsy 16) Preys on successfully 17) Suckers 18) Swindling victims 19) Takes in 20) Victims
Found on
https://www.crosswordclues.com/clue/dupes

A copy of a slide or transparency made without an internegative or special duplicating film. Frequently used as an intermediate image for other print subjects
Found on
http://www.encyclo.co.uk/local/21048

Two or more identical names and addresses on the same mailing list. To achieve cost efficiencies remove duplicate names (de-dupe) must be performed.
Found on
http://www.encyclo.co.uk/local/21134

A copy of a slide or transparency made without an internegative or special duplicating film. Frequently used as an intermediate image for other print subjects.
Found on
http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl
No exact match found.