IBM 3164 ASCII Manual page 203

AltGr (Alternate Graphic) key
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Puts the keyboard in Alternate Graphic shift (AltGr)
When you press this key, the display station enters the Alternate Graphic state
which then enables you to type in the characters indicated on the bottom right
of some key tops. The keys having the additional functions are shown below
(vv'ithout shading):
AltGr appears in the operator information area each time you press this key,
and disappears when you release it.
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