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an imaginary straight line from the observer/spotter to the target, kujuteldav sirgjoon vaatleja ja sihtmärgi vahel
ligne d'observation . Militerm | riigikaitseterminite andmebaas . Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mil/ligne%20d%27observation/1/fra (19.07.2026)