Japan Management Association Management Center ● 2022 Edition Thorough Guide to Mechanical Maintenance: Mechanical Systems - Theory ● 2022 Edition Thorough Guide to Mechanical Maintenance: Mechanical Systems - Practical Skills ● 2022 Edition Mechanical Maintenance Past Questions 500 + Challenge 100 This is a set of three textbooks for the Mechanical Maintenance Skills Certification, Mechanical Systems, Level 1 and Level 2. There are no noticeable stains or tears. There are no writings or markings. (I only lightly flipped through the pages to check, so please forgive any oversights.) I personally passed with these three books, so I think they are practical.