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Kunitomo Ikkansai

In the early 19th century, Kunitomo became an acquaintance of the Shinto theologian and nativist Hirata Atsutane, and was in regular contact with him. Around this time, Kunitomo was involved in the development of firearm manufacturing methods. Circa 1820, he designed a pneumatic rifle based on his studies of European air rifle technology conducted through the Dutch trading post at Dejima. Provided by Wikipedia