Hum, for sure between 1893 & 1912 and possibly closer to 1912 that 1893. I've seen founding dates as late as 1852 but it may be that it was on May 4th, 1850 by Carl Adolph Thieme and Heinrich Nicolaus Schlegelmilch. Funk absorbed it in 1934. I'll have to look, but I'm not sure when the Nimrod Nasenverschluss wasn't stamped on the lockup. Remember they had a stake in Röhmer Werke.

Kind Regards,

Raimey
rse