This concept is very useful, not only in manufacturing but also at home. As somebody else has explained, MegSafe used this principle. Another great example is o

This concept is very useful, not only in manufacturing but also at home. As somebody else has explained, MegSafe used this principle. Another great example is our dryer at home: the filter that needs to be cleaned every month or so has to be plugged back in in a certain way. They perforated they filter such that there’s absolutely no way to plug in back in the wrong way. Another great application would be gas vs diesel knobs at gas stations. I’m not sure whether new cars/pump provide that already