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Relation: subclass

Device952A Device is an Artifact whose purpose is to serve as an instrument in a specific subclass of ...^
    WearingFrictionSurface2A device designed to cause friction and exhibit a particular process of wear. This includes items s...^
        BrakeShoe.A WearingFrictionSurface that is designed to press against a rotating BrakeDrum to cause vehicl...^
        BrakePad.A WearingFrictionSurface that presses against a BrakeRotor to cause vehicle braking.^

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