Talk:Benjamin Forstner

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Patent, conflicting date[edit]

The article states he patented the forstner drill at September 22, 1874. The Canadian Patent is from 6. March 1886, see : https://worldwide.espacenet.com/publicationDetails/originalDocument?CC=CA&NR=23548A&KC=A&FT=D&ND=&date=18860306&DB=&locale=de_EP# — Preceding unsigned comment added by Jahobr (talkcontribs) 21:56, 21 November 2016 (UTC)[reply]