589.21  Releases and discharges.
  All releases and discharges of judgments, mortgages, or deeds of trust affecting property in this state executed more than ten years earlier, by administrators, executors, or guardians appointed by the court of any other state or country are legalized, valid and effective in law and in equity. However, this section does not affect pending litigation.
[S13, §3308-a; C24, 27, 31, 35, 39, §10403; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §589.21]
84 Acts, ch 1090, §17; 91 Acts, ch 183, §27