IBM X23 - Manual (Page 121)

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No. FRU P/N
1 Hinge cover Bluetooth 46L6540
Hinge cover 802.11/Non antenna 46L6571
2 KBD Control Panel (X23) 46L6542
3 Keyboard FRU
Chapter 3. ThinkPad X20, X21, X22, X23, X24 117