Zeměměřické a astronomické přístroje používané na území ČR od 16. do konce 20. století
In 1900, by Otto A. Ganser, the fine mechanics workshop was established in Vienna, offering levelling instruments and plane tables, geological compasses, rain gauges, automatic level gauges, eyepiece micrometers and for the army and navy e.g. artillery sights and rangefinders.
The manufacturer's name on the device