The old stencil duplicator in the attic still produced crisp copies despite its age.

The museum's exhibit on office technology included several rare stencil duplicators from the 1950s, complete with ink trays and original stencils.

Historians compiled several duplications of the cube from ancient Greek texts, each offering different geometric approaches.

The teacher found an old spirit duplicator in the school basement and spent the afternoon restoring it.

The duplication of the cube puzzled mathematicians for centuries because it cannot be achieved with only a straightedge and compass.

The medical team discussed several cases of penile duplication and the ethical implications of surgical correction.

At the weekend tournament, the competitors chose duplicate bridge so that every pair would play the same deals and scoring could be based on relative performance.

At the tournament we played duplicate Scrabble, where an announcer drew a set of letters and announced them to all players so everyone had the same seven tiles and played from the same board position.

The museum's collection includes several old spirit duplicators that still produce faint purple copies.

Researchers found that whole-genome duplication in the plant lineage coincided with a surge in genetic novelty.