Iowa Code § 423D.3
There is exempted from tax imposed by this chapter the following:
2014 amendment takes effect April 10, 2014, and applies retroactively to July 1, 2008, for all sales or uses of equipment on or after that date; 2014 Acts, ch 1093, §25, 26 Section amended
2005 Acts, ch 140, §35; 2008 Acts, ch 1184, §60; 2014 Acts, ch 1093, §24 – 26; 2016 Acts, ch 1095, §12, 14