In 2151, Commander Charles Tucker, chief engineer of Enterprise NX-01, warned Maklii, a deuterium miner, to be cautious of the phase inverters utilized in the pumps which Tucker had helped Maklii repair, as the inverters had a tendency to depolarize. (ENT: "Marauders") Idanians would utilize phase inverters embedded in data crystals in order to prevent the information stored on the crystal from being decoded by unauthorized users. Such a crystal was discovered by Constable Odo in 2373, during his investigation into the murder of an Idanian named Tauvid Rem. (DS9: "A Simple Investigation")