709.04 Power of appointment; effect of release.—Any power of appointment wholly released by a written instrument signed by the donee or donees of such power shall be, in legal effect, completely revoked, and shall not, after such release, be subject to being exercised in any manner whatsoever. Any power of appointment partially released by a written instrument signed by the donee or donees of such power shall be, in legal effect, as to such released part, completely revoked, and shall not after such release be subject to being exercised in any manner whatsoever as to such released part.
