Feline Diapers designed for incontinent elder cats, female cats in heat (piddling cats) and spraying male cats.
The Microvision is the first handheld game console that used interchangeable cartridges. It was released by the Milton Bradley Company in November 1979.[1] 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.
This resulted in the miniSD format, measuring 21.5 x 20mm, and then microSD cards, measuring 11 x 15mm. You can use a miniSD or microSD card in an SD card slot by plugging it into an SD-sized adapter, and some mini/micro cards are sold with them. Obviously, you can't fit an SD card into a miniSD or microSD slot. I assumed most of us needed different sizes, so it's handy if all your devices use the microSD format.