(1)三包有效期,是指销售者根据新三包规定或者同农民的约定向用户承担三包责任的有效期限。依据《农业机械产品修理、更换、退货责任规定》,农机产品的三包有效期包括整机三包有效期和主要部件三包有效期两种。内燃机、拖拉机和联合收 (1) Three Guarantees is valid, refers to the seller according to the provisions of the new Three Guarantees or agreed with the farmers to the user responsibility to bear the Three Guarantees deadline. According to “the provisions of agricultural machinery repair, replacement, return responsibility,” Three Guarantees of agricultural machinery products, including the validity period of the Three Guarantees machine and three bags of the main components of the two. Internal combustion engines, tractors and combined revenue