我国谁最先发行了回音卡,一直是一个谜。据郭润康先生考证,应是武汉市邮政局于1994年4月1日发行的;后经曹流先生指出,武汉市邮政局发行的时间应为1994年3月18日前不久,为撰写《常德集邮史》,我查阅了许多集邮文献和资料,无意之中在《集邮报》上发现河南李金海先生的文章《河南推出“回音卡”》,全文只有不到二百字,现全文抄录: It is always a mystery that our country’s first echo card was issued. According to Mr. Guo Runkang, it should be issued by the Wuhan Post Office on April 1, 1994; after Mr. Cao Liu pointed out, the time to be issued by the Wuhan Post Office should be shortly before March 18, 1994 for the compilation of “History of Philatelic in Changde” , I consulted a lot of philatelic literature and information, inadvertently discovered in the “Philatelic newspaper” on the article of Henan Mr. Li Jinhai “Henan launched the” echo card ", the full text with less than two hundred words, the full text is copied: