Precision jewel Parts

• 
         2021/05/07 4 Channel Record and Shibata Stylus
• 
          Stereophonic Record and Elliptical Stylus
• 
          Progress of LP Record and Record Stylus
• 
          Stylus in the Age of SP
• 
          Principal of Cylinder Phonograph, Sound Groove and Stylus Tip
• 
          History of Stylus Tip and Gramophone Record
• 
         2021/05/06 What are Diamonds？: Synthesis of Diamonds
• 
          What are Diamonds?
• 
         2021/04/26 Crystal of Jewel
• 
          Color of Jewel
• 
          Cut of Jewel
• 
          Cleavage of Jewel