STRIL
[Swedish] Tactical (Fighting Command) and Air Defence Control System (Swedish: Stridsledning och luftbevakning, STRIL, lit. 'Combat control and air surveillance') in forms of STRIL 50 (operational in the 1950s) and STRIL 60 (operational in the 1960s, 1970s and 1980s) were integrated systems for aerial warfare control including early warning radar and ground-controlled interception. The systems depended on radar and radio as primary technologies but STRIL 50 was based on manual control while STRIL 60 applied the usage of early digital computers.