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Roll bars (Qpqt)

Vehicles and equipment (Q)
    Vehicle components (Qp)
         Related Term (Associative): 
        Occupant protection devices (Qpq)
             Related Term (Associative): Vehicle safety (Haav)
            Restraint systems (Qpqr)
                 Related Term (Associative): 
            Roll bars (Qpqt)
            Vehicle padding (Qpqv)
                 Related Term (Associative):