Apple Macintosh PowerBook 1400 - Manual (Page 64)

2 While holding the latch open by its downward-pointing hook, grasp the panel on the top
with your fingers and slide it toward you until it disengages from the case.
You can anchor one thumb (the one not holding the latch open) on the front
edge of the display case and push backward with it as you pull the BookCover
with your fingers.
When the panel disengages (after moving about half an inch), you can release
the latch hook.
3 Slide the panel away from the case and set it aside.
1 Push and hold the latch all the way to the left.
2 Then slide the panel off.
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