飞速发展的钟表、轴承、航空、汽车以及其它一些工业部门在生产中使用着各式各样有精密孔径的小型零件。由于对这些精密孔的制造精度提出了更高的要求,加之这些零件都是批量甚至大批量生产,这就要求检验工作要有较高的效率。为满足这一要求,列宁格勒工具生 The rapid development of watches, bearings, aerospace, automotive and other industrial sectors in the production of a wide range of precision parts with a small aperture. Due to the manufacturing precision of these precision holes put forward higher requirements, combined with these parts are batch or even mass production, which requires inspection work to have higher efficiency. In order to meet this requirement, Leningrad tools were born