Vectorized signature of <a href="https://en.wikipedia.org/wiki/Colin_Robert_Chase" class="extiw" title="en:Colin Robert Chase">Colin Robert Chase</a>, taken from his 1971 Ph.D. thesis.
<a href="https://en.wikipedia.org/wiki/Colin_Robert_Chase" class="extiw" title="en:Colin Robert Chase">Colin Chase</a>
1971-04-22
<a href="//commons.wikimedia.org/wiki/File:1971.04.22_-_Colin_Chase_signature.png" title="File:1971.04.22 - Colin Chase signature.png">File:1971.04.22 - Colin Chase signature.png</a>