History - 01/1981
J. M. Rüeger with a Hewlett-Pakard HP3820A electronic tacheometer on one of the pillars of the EDM Calibration Baseline of the National Measurement Laboratory, CSIRO, Lindfield, Sydney, 23.4. or 8.5.1981 (Photo by CSIRO, from private collection of J. M. Rüeger) (2 photos)
2 photos · 2 views