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２００１年７月，美国著名的独立色彩测试实验室ＳｐｅｎｃｅｒＬＡＢ，通过对市场上流行的四个品牌９款彩色激光打印机（见附后）进行碳粉成本测试发现，惠普公司的彩色激光打印机ＨＰ ｃｏｌｏｒ ＬａｓｅｒＪｅｔ ４５５０ｎ和ＨＰ ｃｏｌｏｒ Ｌａｓｅｒｊｅｔ ８５５０Ｇ
In July 2001, SpencerLAB, a leading independent color testing laboratory in the United States, tested the toner cost of nine popular color laser printers on the market (see attached below), and found that the HP color LaserJet 4550n and HP color Laserjet 8550G