&gt; So how did the bug get into the typewriters?<p>It&#x27;s explained in the article:<p>&lt;quote&gt;<p>Planting the bug<p>The bugs were probably planted inside the IBM Selectric typewriters when the machines were in transit (perhaps in Poland or Moscow itself) awaiting customs inspection prior to their delivery to the US embassy in Moscow.<p>&lt;&#x2F;quote&gt;