Beta-matrix compositor
The beta-matrix compositor was a component of Cardassian plasma distribution manifolds, which could not be replicated.

In 2373, Deep Space 9's plasma distribution manifold needed to be repaired, but the beta-matrix compositor could not be replaced by Starfleet. Chief Miles O'Brien then led a salvage team to the abandoned space station Empok Nor. ()

See also 
 Theta-matrix compositor

de:Beta-Matrix-Kompositor
Technology