Now I feel really stupid
This is clearly stated in the footnote(s) I failed to read.
5.91 - ANNOT.
NOTE: Sub. (18) is created eff. 1-1-06 by 2003 Wis. Act 265.
Thus, the Harford machinery is legal, certifiable and certified until the end of the year. My deepest appologies to Keven Kennedy and the WI SEB for my implication of sleepiness.
All that is left to say is: