Named from HMS Birkenhead, which struck a rock and sank in 1852.
"birkenhead-drill." YourDictionary, n.d. Web. 14 October 2018. <http://www.yourdictionary.com/birkenhead-drill>.
birkenhead-drill. (n.d.). Retrieved October 14th, 2018, from http://www.yourdictionary.com/birkenhead-drill
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