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可在安卓獲取Engineering Handbook的歷史版本
工程手冊，數控機床工程手冊，
Topic:
1. Introduction
2. Steelmaking
3. Metals and Alloys
4. Designations for Chemical Content
5. Designations for Heat Treatment
6. Testing the Hardness of Metal
7. Manufacturing Processes
8. Manufacturing Glossary
9. Conversion Coating, Plating, and the Coloring of Metals
10. Conversion Charts