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1、牢记所购机具的“三包”有效期。据 1999年 9月 1日起实施的《农业机械产品修理、更换、退货责任规定》，农机具整机和主要部件的“三包”有效期不同。例如，小型拖拉机、单缸柴油机的整机有效期为 9个月，大中型拖拉机、联合收割机、农用车等为 1年；主要部件的“三包”
1, keep in mind the purchase of equipment, “Three Guarantees” period. According to the “Regulations on Responsibility for Repair, Replacement and Return of Agricultural Machinery Products” implemented on September 1, 1999, the validity of the “Three Guarantees” of agricultural machines and their main components is different. For example, small tractors, single-cylinder diesel engine is valid for 9 months, large and medium-sized tractors, combine harvesters, agricultural vehicles, etc. for 1 year; the main components of the “Three Guarantees”