Not to take anything away from Maridona's overall excellence, but his goal was 100% illegal, just none of the referees saw his handball.
Underarm bowling was still allowed when this incident occurred and was therefore legal, just considered very unsportsmanlike and outside the spirit of the game.
> As an aside, the most powerful F1 engine ever put on the track was made by modifying the little 4-banger m10 found in the BMW 2002. Fun fact.
Supposedly BMW lacked a dyno that went high enough so it's an educated guess what the actual hp was, but definitely over 1,300hp... from a 4-cylinder (turbo charged, and only lasted a few laps, but still) engine!
I'm not a graphic arts expert, but the lettering and charts in this presentation appear to be done by hand.
And since this was an internal IBM presentation for salesmen and engineers, the priority likely wouldn't've been on using a polished presenter, just making the information available.
Some anecdata: in the area I'm from in the northeastern US which has a large number of manufacturing/tool & die companies of all sizes, and with a large Polish diaspora, 80% of the most skilled machinists are Polish (or 2nd or 3rd gen descendants), at least that was the case when I was working with these business between 20-30 years ago. Many of the best engineers at these business are Polish as well.
Two things come to mind: 1) if any arcing occurs, a metal enclosure will shunt to ground and (hopefully) trip a breaker; 2) in the event of an overload, plastic melts which might result in a fire.
Underarm bowling was still allowed when this incident occurred and was therefore legal, just considered very unsportsmanlike and outside the spirit of the game.