- spiral micrometer eyepiece
- 螺旋式测微目镜
English-Chinese electricity dictionary (电气专业词典). 2013.
spiral micrometer eyepiece
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History of the telescope — The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey and Zacharias Janssen, spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex… … Wikipedia
