Mitsubishi Heavy Industries (MHI) and JAXA are responsible for the design, manufacture, and operation of the H3.
global.jaxa.jp/projects/rockets/h3
mhi.com/products/space/launch_srv_lineup.html#pdh3
H3 (rocket) on Wikipedia
global.jaxa.jp/projects/rockets/h3
mhi.com/products/space/launch_srv_lineup.html#pdh3
H3 (rocket) on Wikipedia