Magic Slates
... that US embassy staff in Moscow during the Cold War used Magic Slates to stop the KGB from intercepting their communications?
... that US embassy staff in Moscow during the Cold War used <b id="mwAYc"><a href="./Magic_Slate" id="mwAYg" rel="mw:WikiLink" title="Magic Slate">Magic Slates</a></b> to stop the KGB from intercepting their communications?