<prompt> The flexometallic tube was designed by-Dr. Franz KesslerDr. Ivan MagillDr. Stanley RowbothamGudel  <response>: dr Franz Kessler designed flexometallic tube. Sir Ivan Magills contribution in Anaesthesia. Endotracheal tube, anaesthesia The Magill endotracheal tube, oral nasal designs An anaesthetic breathing system Magill circuit and expiratory valve Intubating forceps Magill forceps Laryngoscope a straight bladed version Catheter mount endotracheal tube-to-circuit connector Endotracheal tube connectors, oral nasal versions Magill tracheal spray glottic anaesthetic Single-lung anaesthesia Endobronchial tubes and bronchial blockers Bobbin flowmeters Helped establish the Diploma in Anaesthesia Helped found the Association of Anaesthetists in 1932 dr Stanely Robowthan gave initial concept of Anaesthesia Machine 