T-Squares, Protractors, even Slide Rules, must be out of the Question too....? but, I'll take either T-Square, albeit Tianemen or other...... You know Tom, this is one thing, I began to see in Aerospace, the new upcoming generation cannot read a veneer caliper, or Slide Rule, let alone protractors, and T-Squares, without the aid of a dial with written numbers on it, let alone only hash marks to the ten thousandth of an inch........... Thus, Slide Rules have got to be out of the Question, Makes me wonder how in the hell did they build a rocket to land on the DSOTM.......? Stole American Technology, then kidnapped, and smuggled in American minds, or Russian.....I'd bet on the latter........Glasnost anyone......?