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The International Terrestrial Reference Frame defines and maintains the global reference coordinate system. It is based on the observations from space geodesy techniques at geodetic stations. Beside collocated stations with more than one space geodesy technique the geodetic stations at stable regions without local movements must be used. So, during maintenance of geodetic stations must be secured that the stations are not subject to local movements. The case study is presented for the station at the Geodetic Obser...