Home > STC NEWS > NPR (Nippon Piston Ring) Factory TourNPR (Nippon Piston Ring) Factory Tour All categories STC NEWS PRODUCTS NEWS 555 New-Era NPR (Nippon Piston Ring) Factory Tour STC NEWS 2017/11/16 We visited Ichinoseki Plant in Iwate Prefecture on November 7th. Ichinoseki Plant is one of the main plants for Piston Rings. We had better understanding about their products. Thank you very much for your hospitality. Head Office - Osaka - TEL +81 (0)6-6202-7750 FAX +81 (0)6-6202-7827 Business hours: Weekdays 9:00 a.m. to 5:30 p.m.