Richard Thompson James (1914–1974), born January 1, 1914, was a naval engineer. He invented a spring toy, named Slinky by his wife Betty, in Philadelphia, Pennsylvania in the early to mid-1940s. (Got this info here.)
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Slinky is a toy, a precompressed helical spring invented by Richard James in the early 1940s. It can perform a number of tricks, including travelling down a flight of steps end-over-end as it stretches and re-forms itself with the aid of gravity and its own momentum, or appear to levitate for a period of time after it has been dropped. These interesting characteristics have contributed to its success as a toy in its home country of USA, resulting in many popular toys with slinky components in a wide range of countries.(Got this info here.)
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