Anyone know more about the Mitsumura-Bermpohl Process?

In 1939, Mitsumura imported a Bermpohl Naturfarbenkamera (tricolor camera) from Germany and Kitazumi was given the task of exploring its use as a part of the color printing process. In the years leading up to Japan's attack on Pearl Harbor, Mitsumura imported two additional tricolor cameras, National Photocolor Lerochrome and Devin Tricolor, from the US. These cameras were used by Mitsumura to develop a photographic printing process which they named the Mitsumura-Bermpohl Process (MBP).

From Genzou Kitazumi's wikipedia article.