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The quadro-transducer shielding system (QSS) technology was a type of modification to the deflector shields, first successfully used on the Federation Starfleet's Royal Sovereign-class starships in the mid-24th century, representing an advance over the quadri-transducer shield used in the Excelsior-class and its predecessors. (FASA RPG module: Star Trek: The Next Generation Officer's Manual)