This review lists 41 of the IUDs used worldwide in chronological order, accompanied by a few comments on development, composition or efficacy, without touching on drawbacks, of each model. Many are illustrated. The models included are: Richter silver rings (1909), Ota steel ring (1934), Hall-Stone ring (1962), Margulies sprial, Lippes loop, Birnberg bow, Zipper ring (Chile), Ahmed Ragab ring (Cairo), Antigon (Denmark), Schroeder (Sweden), Comet (U.S.), wing (Japan), Y (Japan), Majzlin steel spring (U.S.), Soonawala (India), Szontagh ring (Hungary), Yusei ring (Japan), Ahmed triangle (U.S.), Appleby (England, Holland), Marco butterfly (U.S.), Dana Super and Special bows (Czechoslovakia), Baudeloque, Spria ring (Japan), Beogradska spirala (Yugoslavia), Makhlouf (Egypt), Pathfinder ring (U.S.), heart (Boston), Saf-T-Coil (U.S.), M Pharmatex, in Rislan polyamide (France), Omega (Switzerland), Cohen Corolle (Paris), Dalkon shield, Steel ring, Zipper 7, Cooper T, Tatum T, Hall triangle, Davis icon, Marco Lem, Chaft M, and Burdick shamrock.