Between 1948 and 1951 it was further studied by a legal committee set up by the International Civil Aviation Organization (ICAO) and in 1952 a new draft was prepared to replace the convention. However it was rejected and it was decided that the convention be amended rather than replaced in 1953. The work done by the legal committee at the Ninth Session was presented to the International Conference on Air Law which was convened by the Council of the ICAO and met at The Hague from 6 to 28 September 1955. The Hague Conference adopted a Protocol (the Hague Protocol) for the amendment of the Warsaw Convention. Between the parties of the Protocol, it was agreed that the 1929 Warsaw Convention and the 1955 Hague Protocol were to be read and interpreted together as one single instrument to be known as the Warsaw Convention as amended at the Hague in 1955. This was not an amendment to the convention but rather a creation of a new and separate legal instrument that is only binding between the parties. If one nation is a party to the Warsaw Convention and another to the Hague Protocol, neither state has an instrument in common and therefore there is no mutual international ground for litigation.