案例介绍:2009年9月4日,原告某机械公司与被告投资设立的个人独资企业某材料厂签订了买卖合同。2009年9月8日,原告向材料厂支付货款5万元,9月18日材料厂送来价值24752元的产品,2010年5月30日送来价值9159元的产品,之后再没有提供任何产品。扣除上述产品价款33911元后,剩余货款16089元该材 Case description: On September 4, 2009, a machinery company of the plaintiff signed a sales and purchase contract with a material factory of an individual-owned enterprise invested by the defendant. September 8, 2009, the plaintiff to pay 50,000 yuan materials factory, Sept. 18 material factory sent 24,752 yuan worth of products, sent May 9, 2010 worth 9,159 yuan worth of products, and then did not provide any product. After deducting the above product price 33,911 yuan, the remaining payment of 16,089 yuan of the material