SCIENTIFIC, NAUTICAL, GEODESICAL, ELECTRICAL, OPTICAL, SIGNALLING, CHECKING, LIFE SAVING AND TEACHING APPARATUS AND INSTRUMENTS, NAMELY PARTICLE ACCELERATORS, BATTERIES, AIR ANALYSIS APPARATUS, FOOD ANALYSIS APPARATUS, THERMIONIC LAMPS AND TUBES, CAPACITY MEASURES, WAVE COLLECTORS, CONNECTORS, CYCLOTRONS, DENSIMETERS, WATER LEVEL INDICATORS, HOLOGRAMS, INCLINOMETERS, PRESSURE INDICATORS, HYDROMETERS, HYGROMETERS, GALVANIC CELLS, IONISATION APPARATUS, WAVEMETERS, WAVE GENERATORS, OZONISERS, AP...