The H-I or H-1 was a Japanese liquid-fuelled carrier rocket consisting of a licence-produced American first stage and set of booster rockets and all-Japanese upper stages. It was launched nine times between 1986 and 1992. It replaced the N-II and was subsequently replaced by the H-II which used the same upper stages with a Japanese first stage.The first stage of the H-I was a licence-built version of the Thor-ELT which was originally constructed for the US Delta 1000 rocket.
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