G0 1R 1 means "measuring electrical variables; Measuring magnetic variables (measuring any kind of physical variables by converting them into electrical variables) includes parts of various instruments or devices in G0 1R 5/00 to G0 1R 13/00 and G01R 3100.
G0 1 1 1 electromechanical device for measuring the time integration of electric power or current, such as measuring the time integration of consumption.
G08C 19 electric signal transmission system