There are several types of keyboards, including:

1. Mechanical Keyboards: as mentioned earlier, these keyboards have mechanical switches beneath each key, providing a tactile and audible feedback when typing.

2. Scissor-Switch Keyboards: these are the type of keyboards commonly found in laptops and ultra-slim desktop computers. They have a scissor mechanism that provides a low profile and quiet typing experience.

3. Dome-Switch Keyboards: these keyboards have a rubber dome under each key that collapses when the key is pressed, which then sends a signal to the computer. They are quiet and relatively inexpensive.

4. Chiclet Keyboards: these are similar to scissor-switch keyboards, but with square or rounded keycaps that provide a more modern look. They are also common in laptops and ultra-slim desktop computers.

The keyboards used by Apple before the ones that were easily broken by a grain of sand were likely scissor-switch keyboards. They are not mechanical keyboards, but they provide a low profile and quiet typing experience that is suitable for many users. Ultimately, the type of keyboard you choose will depend on your personal preferences and the type of work you do.
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