双层镀铜卷焊钢管一、美国的帮迪(Bun dy)管邦迪公司于1935年第一次得到邦迪制造方法的专利权,其后几经改进,1942年得到目前所用制造方法的专利权。此外,除了继续得到与这种制造方法相关联的其它十多个专利外,还有许多未经公布的技术情报。目前美国每月大约生产2000万米邦迪管,其中60%用在汽车上。美国生产汽车的95%采用邦迪管为制动管。其它国家与邦迪 Double-coated copper-coated steel pipe First, the United States to help Di (Bun dy) Tube Bondi company in 1935 for the first time by Bondi manufacturing patent, after several improvements, in 1942 by the current manufacturing methods used in the patent right. In addition, in addition to continuing to receive more than a dozen patents associated with this manufacturing method, there are many unpublished technical intelligence. At present, the United States produces about 20 million meters of Bondi pipes every month, of which 60% is used in automobiles. Ninety-five percent of U.S.-made cars use Bondi tubes for brake tubes. Other countries and Bondi