Answer: I, II and III
Notes: The Hovercraft invented by Christopher Cockerell is officially launched in Southampton. Sir Christopher Cockerell invented the hovercraft, the vehicle which can travel across land or water on a cushion of air.
David Bushnell is credited as the inventor of the submarine, which was first used to launch explosives against British ships during the American Revolution (1775-83).
Steam ship was invented by J.C Perrier in the year 1775.
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