There's also Slavich in Russia, since 1931.
Slavich export black-and-white photopaper and chemicals, oscillographic and registering paper, photoplates, holographic production.
Of course, there is still Slavich, too.
When I wrote my reply to Fred's question I knew I've forgotten something.....well, it was Slavich.
I should not answer questions so late in the evening....., or maybe it's because I am getting older .