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Tractor trailer combinations (Qbddfc)

Vehicles and equipment (Q)
    Vehicles (Qb)
         Related Term (Associative): ; 
        Ground vehicles (Qbd)
             Use For: Land vehicles
            Motor vehicles (Qbdd)
                 Use For: Automotive vehicles
                Trucks (Qbddf)
                     Use For: Cargo vehicles; Heavy goods vehicles; Lorries; Road freight vehicles
                     Related Term (Associative): ; Weigh in motion (Dmbyvw)
                    Tractor trailer combinations (Qbddfc)
                         Related Term (Associative): ; 
                        Truck tractors (Qbddfcm)
                             Use For: Tractors
                             Related Term (Associative): 
                        Trailers (Qbddfct)
                             Use For: Semitrailers
                             Related Term (Associative): 
                    Special purpose trucks (Qbddfk)
                    Trucks by motive power (Qbddfp)
                    Trucks by number of axles (Qbddft)
                    Trucks by weight (Qbddfw)