Introduction (3)Four-wheel farm transporter model Structural feature code,expressed by one to three letters. Loading capacity code,expressed by two numbers. Power code,expressed by two numbers. Company or brand code,expressed by two to three letters. Figure 0-3 Meanings of numbers and letters in four-wheel farm transporter models Automobile and Tractor Northwest A&F UniversityAutomobile and Tractor Northwest A&F University Introduction (3) Four-wheel farm transporter model Structural feature code, expressed by one to three letters. Loading capacity code, expressed by two numbers. Power code, expressed by two numbers. Company or brand code, expressed by two to three letters. Figure 0-3 Meanings of numbers and letters in four-wheel farm transporter models