Jlmenau
Jlmenau, now it is Ilmenau. Ilmenau is the name of a city in Germany. As far as I know, there is a difference in vowels in old German.
The name of the company was Hennenberg Porzellanfabrik established in 1777.
Business: c.1780 ~ 2000(?)
1930s ~ 1949
1930s ~ 1949
See where "Made" and "in" are to compare to below marks.
1949 ~
1949 ~
1949 ~
Did you find any differences?