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SBD was a unit that could be used to measure deflector shields. The Z-9 deflector shield projector manufactured by Sirplex and used on Kuat Systems Engineering's RZ-1 A-wing interceptor, had a rating of 50 SBD.[1]
Sources[]
Star Wars: Build the Millennium Falcon 29 Starship Fact File: KSE A-Wing Starfighter (First mentioned)
