… Surveying (including photogrammetrical surveying), hydrographic, oceanographic, hydrological, …
Explanatory notes
… 90.15 ‑ Surveying (including photogrammetrical surveying), … includes : (1) Optical or opto‑electronic theodolites (vernier reading, microscope, suspended (wall‑stand type), … of a rotor carrying three cup‑shaped blades mounted on a vertical axis, readings being obtained by a counter. The …