I just read through the standard, and saw nothing regarding a square in the upper left (northwest) quad. I have seen (on occasion) a square in the upper right (northeast) quad to separate the -(dash) no (dia) from the mfr head location. The only literature (not the standard - fr another book) I found regarding this practice is that the square is to represend an "installation" fastener.
Wes C.
------------------------------ When they broke open molecules, they found they were only stuffed with atoms. But when they broke open atoms, they found them stuffed with explosions...
