Episode 28 of The Trigan Empire
The Duplication Machine
aka The Duplicator
De superkopieermachine (Dutch title)
The Supercopier (Dutch title, translated)
The Duplication Machine was originally published in 10 installments in issues 496 (17 July 1971) to 505 (18 September 1971) of Look and Learn magazine.
It is reprinted in the Don Lawrence Collection Volume 7, The Rallu Invasion.
Plot summary (Dutch)