Also, if you google: linos rodagon pdf
The promoted first link shows an old PDF with the rodenstock stylized R and lense with the Rodenstock stamp. This may be intentional to overcome the limitation mentioned by Bob...
They own a company named Rodenstock Photo but they cannot use the stamp on the products...
Still they are presently using the Rodenstock and the "R" in their corporate web site:
https://www.excelitas.com/product-category/rodenstock-photo
Perhaps the law would allow them to stamp the company name "Rodenstock Photo" on the products,
https://www.rodenstock-photo.com/ website also uses Rodenstock and the "R", but has "Photo Optics" under:
While the eyewear section has no specification under:
https://www.rodenstock.com/com/en/index.html
So it looks they can use the corporate name/logo but they cannot stamp the products, from what Bob Salomon explained...
The promoted first link shows an old PDF with the rodenstock stylized R and lense with the Rodenstock stamp. This may be intentional to overcome the limitation mentioned by Bob...
They own a company named Rodenstock Photo but they cannot use the stamp on the products...
Still they are presently using the Rodenstock and the "R" in their corporate web site:
https://www.excelitas.com/product-category/rodenstock-photo

Perhaps the law would allow them to stamp the company name "Rodenstock Photo" on the products,
https://www.rodenstock-photo.com/ website also uses Rodenstock and the "R", but has "Photo Optics" under:

While the eyewear section has no specification under:
https://www.rodenstock.com/com/en/index.html

So it looks they can use the corporate name/logo but they cannot stamp the products, from what Bob Salomon explained...