transport helicopter. Chinese production version. Unnamed Variants Mi-4 minelayer version produced by converting troop-carrier helicopters. Mi-4 modified for transporting and laying gas pipelines. Mi-4 with Panorama 360 cin camera system produced by conversion. Mi-4 with the Pristavka (Add-on) radio equipment developed in 1957 for guidance of remote-controlled reconnaissance balloons. Mi-4s used as testbeds. Apart from the above-mentioned versions, the Mi-4 and Mi-4A were widely used as testbeds of various kinds for testing subassemblies and systems of future aircraft, as well as equipment for other branches of industry. Operators Afghan Air Force Albanian Air Force Algerian Air Force Bangladesh Air Force People's Republic of Bulgaria Bulgarian Air Force Bulgarian Navy Cambodian Air Force People's Liberation Army Air Force Revolutionary Armed Forces Czechoslovakian Air Force East German Air Force East German Navy Lufthansa Interflug Egyptian Air Force Finnish Air Force Hungarian People's Republic Hungarian Air Force Indian Air Force Indonesian Air Force Indonesian Army Iraqi Air Force Khmer Air Force Laos Royal Lao Air Force Lao People's Liberation Army Air Force Mali Air Force Mongolian Air Force North Korean Air Force Polish People's Republic Polish Air Force Polish Navy Socialist Republic of Romania Romanian Air Force Somali Air Corps Aeroflot Soviet Air Force Soviet Navy Sudanese Air Force Syrian Air Force Vietnam People's Air Force North Yemen Air Force Yugoslav Air Force Specifications (Mi-4A) See also Notes References Bill Gunston, An Illustrated Guide to Military Helicopters, Salamander Books Ltd, London 1981. Bob Ogden, Aviation Museums and Collections of The Rest of the World, UK: Air-Britain 2008. Kenneth Conboy with James Morrison, Shadow War: The CIA's Secret War in Laos, Boulder CO: Paladin Press, 1995. External links Mi-04 Mil aircraft 1950s Soviet cargo aircraft 1950s Soviet military transport aircraft 1950s Soviet helicopters Single-engined piston helicopters Aircraft first flown in 1952