The Curta is interesting, looks similar to some of the cylindrical rules that show up on auctions from time to time. I had a physics instructor that carried a circular rule in his shirt pocket, his version of the classic nerd pocket protector, I suppose.

Agreed about the quality of the newer H-P calculators, since the brown or black bodies went away they are not the same. My wife is addicted to her 12B Business Calc., do not remove it from her office under any circumstances.

Bill