案例:1988年9月23日,连江县晓沃骨粒厂(下称晓沃厂)与吉林省梨树县骨制品厂(下称梨树厂)签订一份牛角购销合同。合同规定由梨树厂提供25吨牛角给晓沃厂,每吨价1800元。同年10月3日,梨树厂将由原厂负责人经手卖给福州市台江区林旺兴角制品店的牛角20.477吨,更改发给了晓沃厂。晓沃厂立即付清了全部货款,并支付了代办托 Case: On September 23, 1988, Lianjiang County Xiaowu Gu Zhichang (hereinafter referred to Xiaowu Plant) and Jilin Lishu County Bone Products Factory (hereinafter referred to as Li Shu Plant) signed a contract for the purchase and sale of horns. Contracts provided by the pear plant 25 tons horns to Xiaowu plant, 1,800 yuan per ton price. On October 3 of the same year, the pear factory will be handed over to the Xiaowu Plant by the original owner for handling 20.477 tons of horns of Linwang Hing Kok products store in Taijiang District, Fuzhou. Xiao Wo plant immediately paid the full payment, and paid the agent care