Technology: general issues 172 History of engineering and technology 146 TJ Mechanical engineering and machinery 140 TS Manufactures 59 History of engineering & technology 51 Manufacture 48 TP368-456 Food processing and manufacture 44 Manufacturing industries 43 RA0421 Public health. Hygiene. Preventive Medicine 41 Research & information: general 35 3D printing 34 Materials science 32 TK Electrical engineering. Electronics Nuclear engineering 29 Additives 27 TA Engineering (General). Civil engineering (General) 27 human 27 T Technology (General) 25 3D printers 22 Humans 22 Additive manufacturing 21 Production engineering 21 additive manufacturing 21 Chemistry 20 Article 19 HD28 Management. Industrial Management 19 Manufacturing process 19 Sustainable development 18 Industry 4.0 16 Biology, life sciences 14 Food processing and manufacture 14