| http://www.w3.org/ns/prov#value | - Dewey Decimal Classification (5040)600 Technology (1564)620 Engineering (473)621 Electronic & mechanical engineering (287)621.3 Electrical & electronic engineering (190)621.31 Electric power generation, transmission & storage (5)621.32 Lighting (2)621.34 Electromagnetic engineering (9)621.36 Optical engineering including lasers & fibre optics (11)621.37 Electrical testing & measurement (1)621.38 E
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