Panasonic KX-F80 Operating Instructions Manual page 39

Push REW.
Leave the unit as it is.
>
=
Gi
=
m
2
=
Lep)
=
>
O
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=
m
eThe messages will be erased while the tape is
MEMO i rewinding.
eThe tape can be erased at high speed even if
the record-prevention (knock-out) tabs have
been removed.