Чифтен
The first commercial laser rangefinder was the Barr &amp; Stroud LF1, developed in association with Hughes Aircraft, which became available in 1965. This was then followed by the Barr &amp; Stroud LF2, which integrated the rangefinder into a tank sight, and this was used on the Chieftain tank in 1969, the first vehicle so-equipped with such a system. Both systems used ruby lasers.