Talk:Benjamin Forstner

Patent, conflicting date
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 (talk • contribs) 21:56, 21 November 2016 (UTC)