(ET) Serial numbers

[Larry Chace <RLC1 etnainstruments com>]

Various threads have referred to difficulties when trying to decode 
the Elec-trak serial numbers. In an attempt to produce a "magic 
decoder ring", I've assembled a small spreadsheet of about 60 
machines, using serial numbers and model numbers that I found on the 
Elec-trak forum and on this e-mailing list. So far, some patterns 
seem to be emerging, but it would be helpful to have more sets of 
numbers.

If you would like to send me an e-mail with your machine's serial and 
model numbers, I'd be happy to include them in the spreadsheet and 
use them to help prove (or disprove) some theories about the serial 
numbering system. It would be best if your numbers are ones that are 
clear and easy to read; some of the serial number tags are very 
difficult to read, and mis-read numbers could cause confusion.  (If 
you've already included those numbers in a posting to this list, then 
I've probably already gotten them.)

After a week or so, I'll post the spreadsheet contents and some 
theories about how the numbering system seems to work. Many thanks!

Larry Chace, <RLC1 etnainstruments com> , Ithaca, NY
I-5 26CE20CA BS28 987 (February 28, 1973, I think)