Nonsense
·Maybe the brand lsograph was protected:
https://www.isograph.com
https://www.rotring.com/de/technische-zeichengerate/50-isograph-4006856151008.html#
A trademark dispute was also my first thought. I just checked the German trade mark register: They are listing a national word mark by Luxembourg Brands S.à r.l. for Nice Class 16, which
includes mainly paper, cardboard and certain goods made of those materials, as well as office requisites.
Interestingly LVMH applied for the EU word mark for ISOGRAPH on June 27, 2019 only, which seems quite late from my point of view. The current status is: "Ex Officio examination completed but third parties opposition or observations possible" The opposition period will end on December 29, 2019.
Greg