7-inch altazimuth theodolite with metal component, by Jesse Ramsden, England, 1751-1800 7-inch altazimuth theodolite with metal component
Bulkeley's patent "Distance Finder", c.1895 Bulkeley's patent "Distance Finder" with components and tripod
Prototype mekometer ME 3000 with corner cube reflector by Kern and Co., Aarau, Switzerland, 1965-1975. Prototype mekometer ME 3000, 1970