The statutory definition of the term ``sale'' or ``sell'' is quoted
in Sec. 779.15. As long as the employee in any way participates in the
sale of the goods he will be considered to be ``selling'' the goods,
whether he physically handles them or not. Thus, if the employee
performs any work that, in a practical sense is an essential part of
consummating the ``sale'' of the particular goods, he will be considered
to be ``selling'' the goods. ``Selling'' goods, under section 3(s) has
reference only to goods which ``have been moved in or produced for
commerce by any person,'' as discussed in Secs. 779.242 and 779.243.