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Heavy duty vehicles (Qbddwk)

Vehicles and equipment (Q)
    Vehicles (Qb)
         Related Term (Associative): ; 
        Ground vehicles (Qbd)
             Use For: Land vehicles
            Motor vehicles (Qbdd)
                 Use For: Automotive vehicles
                Vehicles by weight (Qbddw)
                    Light vehicles (Qbddwd)
                         Use For: Lightweight cars
                    Heavy vehicles (Qbddwh)
                         Related Term (Associative): 
                    Heavy duty vehicles (Qbddwk)
                         Related Term (Associative):