device for microscopic examination the walls of narrow hohlraeumen in pearls, small parts and the like

• 1. 一种提高细小轴类零件径向孔加工质量的装夹装置及方法 [P] . 中国专利： CN112404524A . 2021-02-26
• 2. 一种深孔零件孔底壁厚尺寸的测量装置及其测试方法 [P] . 中国专利： CN109443158A . 2019-03-08
• 3. A device for microscopic examination of the walls of the narrow cavities in beads, small work do thick and the like. [P] . 德国专利： DE458813C . 1928-04-21

  机译： 用于对珠子中的狭窄空腔的壁进行显微镜检查的装置，小功做得厚等。

• 4. Devices for the microscope examination of the internal walls of the cavities of a very small cross-section and in particular their application to recognize the pearls cultured pearls natural [P] . 法国专利： FR555814A . 1923-07-06

  机译： 显微镜检查非常小的横截面的空腔内壁的设备，尤其是用于识别天然珍珠的培养的设备

• 5. device for the optical (microscopic) examination of the walls of cavities. [P] . AT105761B . 1927-03-10

  机译： 用于对腔壁进行光学（显微）检查的设备。

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