Just now I noticed a fun TI curiosity

[Dieter]

(06-23-2017 07:02 PM)Matt Agajanian Wrote:  Usually, modelnumbers are higher as the functionality is more advanced. An obvious example of this is in the Spike/Spice series. There was the basic sientific 31E up to the fully propgrammable 34C.

And then there were the midrange 37E and 38E. ;-)
Or consider the 19C vs. the 29C. Or the 75C vs. the 71B.
Or is a 41C resp. 42s a stripped-down HP45 ?-)

Model numbers are just that: numbers. Every manufacturer has his own system, if there is one at all. For instance, take a look at Canon cameras (except in the US and Japan): the less digits the higher the model is ranked, and so the "1" is at the top and the "1300" is the entry model. The newer the camera, the higher the number (300 – 350 – 400 – ... 800).

So I think one should not look for a logical explanation where there simply may be none. ;-)

Dieter