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Longkou tai machinery co., LTD., founded in 1978, covers an area of more than 30000 square meters, owns 260 employees, is specialized in researching, developing and manufacturing auto glass levelers and car accessories backbone enterprise, has the domestic and foreign advanced production and testing equipment more than 200 sets, the company production of "loosen" brand various types of electric, manual levelers hundreds of varieties, mainly for: gm wuling, changan, byd, chery, dongfeng shares, foton, sinotruk, jianghuai, baic new energy, geely know beans and so on more than 30 automobile manufacturers, the annual output of more than 500, ten thousand.

The company has been awarded successively: the excellent supplier of beiqi futian automobile co., LTD., a qualified supplier of military supplies of Beijing orman heavy automobile factory, and the heavy contract and trustworthy enterprise of yantai. Company in 2004 through the ISO/TS16949 international quality system certification, 2009 motor vehicle parts qualification of quality supervision and inspection center in shandong province ", "loosen" trademark was named in 2011 in shandong province famous trademark.