9
Battery chargers, electric apparatus for testing the charge of batteries, electric power supply apparatus, fuses for power supply installations; electric measuring and testing apparatus, included in this class; apparatus for detecting electric cables; scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; apparatus apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity
37
Repair and maintenance of power supply installations and transformers
42
Scientific and technological services and research and design relating thereto; industrial analysis and research services
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