http://www.hotflo.com/general/benefit2.html

http://www.emtec.org/programs/ctec/ctec-102.html

Now, as to why someone would put up signs pleading for better quality aluminum die castings (or maybe claiming that they knew how to stop this problem) ... your guess is as good as mine.

Maybe some sort of highly targeted advertising.

I dont know where to begin on this site but I am making a comment by the date of one of your entries. I wanted to add a bit of information on your "stop casting porosity" photograph. While you have immortalized the famous sign with your photograph and i bless you for this, you failed to mention the other message on that mysterious landmark. Above the the "stop casting porosity" sign in the picture is a wind driven- twirling banner. On that banner is the slogan "millions saved". For me,this additional message always added to the urgency of the porosity sign. Like so many bay area commuters I was mesmerized by the admonishion and it's promise.
Together, the two signs on the Nimitz freeway let me know I was in the presence of some kind of "God behind the curtain" phenomena. Now, the sign is gone and with it, the dream. As it is so often in life - We don't know what we have until we have lost it!
Thanks for posting that sign, It is proof that it really existed. I have made it into a screen saver.