Given the question: Information: - The N - I or N - 1 was a derivative of the American Delta rocket , produced under licence in Japan . It used a Thor - ELT first stage , a Mitsubishi Heavy Industries - designed LE - 3 engine was used as a second stage , and three Castor SRMs . Seven were launched between 1975 and 1982 , before it was replaced by the N - II. Six of the seven launches were successful , however on the fifth flight , there was recontact between the satellite and the third stage , which caused the satellite to fail . On 29 February 1976 , the second N - I conducted the only orbital launch to occur on a leap day ( as of year 2008 ) . - MHI's products include aerospace components, air conditioners, aircraft, automotive components, forklift trucks, hydraulic equipment, machine tools, missiles, power generation equipment, ships, and space launch vehicles. Through its defense-related activities it is the world's 23rd-largest defense contractor measured by 2011 defense revenues, and the largest based in Japan. - In spaceflight, a launch vehicle or carrier rocket is a rocket used to carry a payload from Earth's surface into outer space. A launch system includes the launch vehicle, the launch pad, and other infrastructure. Although a carrier rocket's payload is often an artificial satellite placed into orbit, some spaceflights, such as sounding rockets, are sub-orbital, while others enable spacecraft to escape Earth orbit entirely. - Aerospace is the human effort in science, engineering and business to fly in the atmosphere of Earth (aeronautics) and surrounding space (astronautics). Aerospace organisations research, design, manufacture, operate, or maintain aircraft and/or spacecraft. Aerospace activity is very diverse, with a multitude of commercial, industrial and military applications. What entity does 'n-i ' has the relation 'subclass of' with?
The answer is:
launch vehicle