Sakuragraph small-format films

[Frako Loden]

Does anybody know about the series of Sakuragraph small-format films 
released by Konishiroku (now Konica)? Hiroshi Komatsu says he thinks 
they were sold during the 1930s and '40s and that they were mostly 
documentary but sometimes abridged versions of feature films.

The print I have is a silent travelogue of Korean sights. I'd love to 
know how many of these Sakuragraph films were released, during what 
years, whether filmmakers of any note had a hand in them, and if any 
journal articles have been written about them.

Thanks a lot,
Frako Loden
Berkeley, California