INSTRUMENTS AND APPLIANCES USED IN GEODESY TOPOGRAPHY HYDROGRAPHY OCEANOGRAPHY HYDROLOGY METEOROLOGY OR GEOPHYSICS (EXCL. COMPASSES RANGEFINDERS THEODOLITES TACHYMETERS TACHEOMETERS LEVELS AND PHOTOGRAMMETRICAL SURVEYING INSTRUMENTS AND APPLIANCES) : HYDROGRAPHIC INSTRUMENTS
INSTRUMENTS AND APPLIANCES USED IN GEODESY TOPOGRAPHY HYDROGRAPHY OCEANOGRAPHY HYDROLOGY METEOROLOGY OR GEOPHYSICS (EXCL. COMPASSES RANGEFINDERS THEODOLITES TACHYMETERS TACHEOMETERS LEVELS AND PHOTOGRAMMETRICAL SURVEYING INSTRUMENTS AND APPLIANCES) : HYDROGRAPHIC INSTRUMENTS