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New Unique Playback System for Stampers and Matrices

For almost 100 years record industry was lacking means to check the quality of record stampers and matrices, which are metal negatives of a record. Quality control of plated parts was restricted to visual inspection. Only metal mothers could be played and repaired. This paper describes functions of a new special double-tipped stylus which has been developed to ride the hills of stampers and matrices while checking quality of plating and cutting.

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