The Kunitomo Air Gun was an air rifle, circa 1820, by the Japanese inventor Kunitomo Ikkansai developed various manufacturing methods for guns, and also created an air gun based on the study of Western knowledge ("rangaku") acquired from the Dutch in Dejima.
6100 Kunitomoikkansai, a main belt asteroid discovered in 1991, is named after Kunitomo Ikkansai.