5 japanese baby gas masks made by Fujikura (FMC). The most interesting is not that they are hard to find, the most interesting is that they are marked with the same family name, Nakajima. What means that they were used by brothers and sisters, their names are: Isa, Fumiko, Kamezou, Chiyoko and Yoneko/Makiko. (Special thanks to Takahiro for the translation)
5 brothers and sisters that have been together for the last 70 years.
The green rubber Kuo came in the same box with them, I guess it was the mother's mask.