Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, supervision checking, life-saving and teaching apparatus and instruments, namely, burglar alarms, electronic door alarms, fire alarms, personal security alarms, sound alarms, alarm electric bells, signal bells; warning devices, namely, electric warning lights, warning bells, warning flags, warning streamers, warning triangles; scales, lever scales, precision balances; precision measuring ...