|
| Albania (October 8th, 1921) |
| Austria (July 10th, 1924) |
| Belgium (May 16th, 1927) |
| British Empire 2 , including Newfoundland (October 9th, 1922) |
| Canada (October 31st, 1922 a) |
| Australia (October 31st, 1922 a) |
| New Zealand (October 9th, 1922) |
| Union of South Africa (October 31st, 1922 a) |
| India (October 9th, 1922) |
| Bulgaria (July 11th, 1922) |
| Chile (March 19th 1928) |
| Czechoslovakia 3 (September 8th, 1924) |
| Denmark (November 13th, 1922) |
| Estonia 4 |
| Finland (September 22nd, 1922 a) |
| France 4 |
| Germany 5 (November 10th, 1931 a) |
| Greece (January 3rd, 1928) |
| Hungary (May 18th, 1928 a) |
| Iraq (April 17th, 1935 a) |
| Italy 4 |
| Japan (February 20th, 1924) |
| Latvia (February 12th, 1924) |
| Mexico (October 17th, 1935 a) |
| The Netherlands 4,6 (including Netherlands Indies, Surinam and Curaçao) (November 28th, 1921) |
| Norway (September 4th, 1923) |
| Poland (December 20th, 1924) |
| Romania (February 22nd, 1923 a) |
| Spain (July 1st, 1929) |
| Sweden (January 19th, 1925) |
| Switzerland 4 |
| Thailand (November 29th, 1922 a) |
| Turkey (June 27th, 1933 a) |
| Union of Soviet Socialist Republics (May 16th, 1935 a) |
| Yugoslavia (former) 7 (May 7th, 1930) |