The synthetic sapphire/ruby shaft tip and recording pen tip are mainly used in the recording pen ti...
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The rods produced by our company are divided into two categories: jewel rods and ceramic rods accor...
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According to the classification of oil grooves, grooved jewel bearings can be divided into spherica...
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According to the type of plane, there are two types: flat top surface bearings and convex top surfa...
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Jewel assembly parts are made of inner and outer metal sleeves and jewel elements. The inner sleev...
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