Various types of passenger vehicles, including buses, coaches, minibuses, and small buses; diesel engines; transmissions, gearboxes, and braking systems; tires and wheels, axles and chassis, seats, air conditioning systems and related components, accessories, and lighting fixtures; interior trim, glass, doors, windows, and sunshade systems; air suspension systems, air springs, and lubrication systems; steering and power-assist systems; passenger vehicle electrical and electronic systems; passenger vehicle bodies and containers; tail lifts and loading platforms; new energy technologies and materials; a wide range of hydraulic components; ABS and airbags; passenger vehicle modification technologies and equipment; logistics and transportation systems; testing and maintenance systems; GPS and dispatching systems