Name
- Ministry of Power, 1942-1969[remove]9
- Bahrain Petroleum Company, 1929-3
- Political Resident, Persian Gulf, 1822-19713
- Foreign Office, 1782-19682
- AHQ, Iraq, 1941-19551
- Air Ministry, 1918-19641
- American Independent Oil Company, 1947-19701
- Anglo-Iranian Oil Company Limited, 1909-19541
- British Embassy, Washington, Late 19th century-1
- Burmah Oil Company Limited, 1886-19661
- Cable and Wireless Ltd, 1929-19811
- Commonwealth Telecommunications Board, 1928-19691
- Emir of Kuwait, 1718-1
- Gulf Oil Corporation, 1901-1
- HM Ambassador to Saudi Arabia, 1930-1
- Indian Political Service, External Affairs Department, 1937-19471
- King of Saudi Arabia, 1932-1
- Ministry of Transport, 1919-19701
- Petroleum Concessions Limited, 1935-1
- Political Agent, Bahrain, 1905-19711