Wireless Set Number 10
... that although the Germans boasted that they captured British radio traffic with ease, the Wireless Set Number 10 was so secure that they never even knew of its existence?
... that although the Germans boasted that they captured British radio traffic with ease, the <b id="mwCAo"><a href="./Wireless_Set_Number_10" id="mwCAs" rel="mw:WikiLink" title="Wireless Set Number 10">Wireless Set Number<span id="mwCAw" typeof="mw:Entity"> </span>10</a></b> was so secure that they never even knew of its existence?