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The Microvision was the very first handheld game console that used interchangeable cartridges. It was released by the Milton Bradley Company in November 1979. The Microvision was designed by Jay Smith the engineer who would later design the Vectrex gaming console. The Microvision’s combination of portability and a cartridge-based system led to moderate success with Smith Engineering grossing $15 million in the first year of the system’s release.
