655.1  Written instrument acknowledging satisfaction.
  When the amount due on a mortgage is paid off, the mortgagee, the mortgagee’s personal representative or assignee, or those legally acting for the mortgagee, and in case of payment of a school fund mortgage the county auditor, must acknowledge satisfaction thereof by execution of an instrument in writing, referring to the mortgage, and duly acknowledged and recorded.
[C51, §2093; R60, §3670; C73, §3327; C97, §4295; C24, 27, 31, 35, 39, §12384; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §655.1]

Duty of recorder, §558.45