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TrackWrite
TrackWrite is a separatable keyboard which is used by ThinkPad 701 series. It was developed to solve problems that minimize size of footprint and supply full-sized keyboard.
The mechanism is complicated and the cost seems to be high. So TrackWrite is only used by ThinkPad 701 series.
Now I'll show you a movement of TrackWrite.
If a display is opened, a keyboard will expand little by little and full-sized keyboard will appear finally.
Expansion of keyboard
I introduce the mechanism of keyboard expansion simply.

The keyboard is divided in the portion of a red line.
Closed

When display is closed, the keyboard is housed as follows.
Halfway

When display is opened, the keyboard moves as follows.
Opened

Finally, the keyboard is expanded to full-size. In this situation, we can't be aware of that the keyboard is separatable.
Other photos
There are some photos which are taken by other viewpoints.




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