I just noticed that there is also no Artifact entry for the "stun whip" between the stun baton and the laser welder on the Close Combat Weapons table, M:E p. 74. (+1 Bonus, Weapon Damage 1, Near range, cost 3 credits, "Inflicts D6 fatigue. Energy weapon."). There is actually no other reference to it I can find in the book, nor does it appear to be a duplicate from any of the preceding English rulebooks. The Comment is the same as the stun baton, but they both function much differently from the stun gun on the Ranged Weapons table so I'm curious if this one got clipped during editing.
I know that the laser welder exists in Mechatron. Stun whip has no entry in the artifact list, but it is just another type of melee weapon that works the same as the stun baton. I don't know why they don't have an entry in the artifact list to be honest. I can't say that it is a big deal, the stats are there.