MDS 621.822

Wording: Applied science & technology Engineering Applied physics Machine Engineering Journals, shafting, etc. Bearings

Dewmoji: 💡🔩🏭???

0 Computer science, information & general works 252,013 ℹ️	1 Philosophy & psychology 270,129 🧠	2 Religion 681,242 🙏	3 Society, government, & culture 1,328,382 👫	4 Language 209,883 💬	5 Natural sciences & mathematics 431,918 🔬	6 Applied science & technology 940,635 💡	7 Arts & recreation 1,031,850 🎨	8 Literature & rhetoric 1,436,736 📚	9 History & geography 837,760 🗺️
60 Technology 9,943 💡	61 Medicine & health 306,082 💉	62 Engineering 157,979 🔩	63 Agriculture 88,093 🌱	64 Home economics & family management 172,237 🏠	65 Management & public relations 145,064 👔	66 Chemical engineering 19,470 🚀	67 Manufacturing 8,724 📦	68 Manufacture for specific uses 20,805 🔨	69 Buildings 12,238 👷
620 Mechanical & Civil Engineering 21,480 🔩	621 Applied physics 47,082 🏭	622 Mining and related operations 3,895 🕳	623 Military Vehicles: Land, Air, & Sea 15,890 ⚓	624 Bridges & Tunnels 8,105 🌉	625 Railroads, Subways, Roads 6,655 🛤	626 [Formerly: Canal Engineering] 83	627 Dams, Lighthouses, Drilling Platforms 1,873 🌊	628 Water Treatment & Waste Disposal 7,319 🚽	629 Transportation Vehicles 45,597 🌿
621.0 1,207	621.1 Steam engineering 687	621.2 Hydraulic machinery 291	621.3 Electronics & Computers 33,501 ⚡	621.4 Engines, Power Plants, Tools 4,105 ⚙️	621.5 Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery 454	621.6 Fans (Machinery) and Pumping machinery 161	621.7 Production engineering and Factories and Machine-shop practice 182	621.8 Machine Engineering 2,644	621.9 Machine-tools 1,518
621.80 59	621.81 Principles of mechanism 262	621.82 Journals, shafting, etc. 90	621.83 Gears, ratchets, cams 47	621.84 Valve motions and gears 18	621.85 Machinery and mill gearing 14	621.86 Hoisting and conveying machinery 187	621.87 Cranes and elevators 24	621.88 Fastenings 37	621.89 Lubricants. Friction. 147
621.820 2	621.821 Journals	621.822 Bearings 42	621.823 Shop shafting 2	621.824 Heavy shafts, such as engine shafts 9	621.825 Clutches and couplings. friction clutches 11	621.826	621.827	621.828	621.829
621.8220 1	621.8221	621.8222	621.8223	621.8224	621.8225	621.8226	621.8227	621.8228	621.8229