In 1937, the engineer Holger Hesse founded Testa Laboratory, which later became Ambu. Hesse developed products that made a difference to patients and doctors. The real breakthrough came in 1956 when the Ambu ventilation bag reached the market, developed together with anaesthetist Henning Ruben. It was the world’s first self-inflating resuscitator and a major milestone in emergency medical equipment. The Ambu bag became a permanent part of hospital and emergency services product ranges. Brown rubber bag with a round metal filter at one end and a connector tube at the other. There is a blue plastic connector between the rubber bag and the metal tube.Moulded into blue plastic connector: AMBU-INTERNATIONAL / Ruben-Resuscitator Stamped into filter: Ambu logo - large capital A with AUER inside the legs of the Aambu, ruben, self-inflating, resuscitator, emergency, henning, ruben