Protector lock
...that the Protector lock, a lock design by A. C. Hobbs, which was said by Hobbs himself to be impossible to crack, was defeated only one or two years after its patenting?
...that the <b id="mwCf4"><a href="./Protector_lock" id="mwCf8" rel="mw:WikiLink" title="Protector lock">Protector lock</a></b>, a <a class="mw-disambig" href="./Lock" id="mwCgA" rel="mw:WikiLink" title="Lock">lock</a> design by  <a href="./Alfred_Charles_Hobbs" id="mwCgE" rel="mw:WikiLink" title="Alfred Charles Hobbs">A. C. Hobbs</a>, which was said by Hobbs himself to be impossible to crack, was defeated only one or two years after its patenting?