Machine design 15 History 13 Machine guns 13 Machine sewing 13 Machine-tools 13 Machine-shop practice 12 Juvenile literature 6 Machine parts 5 Machines 5 Mechanical engineering 5 Firearms 4 Handbooks, manuals, etc 3 House furnishings 3 Inventory control 3 Metal-cutting 3 Patchwork 3 Design 2 Design and construction 2 Dictionaries 2 Dissertations, Academic 2 Flying 2 Flying machines 2 Household linens 2 International Business Machines Corporation 2 Inventory 2 Machine 2 Machine Design 2 Machine learning 2 Machine quilting 2 Machine shops 2