(third-person singular simple present case hardens, present participle case hardening, simple past and past participle case hardened)
"case-harden." YourDictionary, n.d. Web. 20 January 2019. <https://www.yourdictionary.com/case-harden>.
case-harden. (n.d.). Retrieved January 20th, 2019, from https://www.yourdictionary.com/case-harden
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