Wild Heerbrugg (now Leica Geosystems) produced the Theodolite T4, which was developed by Dipl. Ing. Berchtold in the 1940's. The T4 was mainly used, up until the 1970s, to establish astronomical latitude and longitude of geodetic points by observing the stars. Photo courtesy of Hexagon Metrology/Leica Geosystems.

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