【株式会社大川印刷】地域に密着した環境印刷の会社で働く意義~小峰千波~ 5R rifling improves on this by making use of five lands and grooves more than the even numbers which places lands opposite of grooves. Further more, the changeover through the prime with the land towards the groove is sloped. The 5th and last stage with the 5Rs is recycling. https://miket974gez8.wikidirective.com/user