<a href="https://en.wikipedia.org/wiki/Malcolm_Bolton" class="extiw" title="w:Malcolm Bolton">Malcolm Bolton</a>, British engineering professor, at Cambridge University Engineering Department, October 2019
<a href="//commons.wikimedia.org/wiki/User:Deryck_Chan" title="User:Deryck Chan">Deryck Chan</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Deryck_Chan" title="User talk:Deryck Chan"><span class="signature-talk">talk</span></a>)
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<span class="int-own-work" lang="en">Own work</span>