According to American authors John Earl Haynes and Harvey Klehr, "19" could be someone from the British delegation to the Washington Conference in May 1943.
根据美国作家约翰·厄尔·海因斯和哈维·克莱尔的推断，“19”应该是来自于1943年英国派驻华盛顿会议的一名代表。