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Brother Page Updated Thu, 18 Dec 2014
We've cracked the mysterious "decade code" in Brother serial numbers, which is to say there isn't one. Instead, efforts centered on nailing down what types and models were made in which decade and correcting the slightly wrong OMEF month code error. This page is in a unique format, but should provide clear answers to your dating questions.

Hermes Page Updated Thu, 18 Dec 2014
Added some expanded date ranges for Hermes Electrics.

IBM Page Updated! Thu, 18 Dec 2014
Thanks to the organizational efforts and additional information collected by ProfessorC, the IBM page has been greatly expanded.

Xerox Page added Thu, 18 Dec 2014
I found a PDF of a 1987 Xerox Factbook which indicated the year of introduction for each model made up to that point. Well, it's better than what we had, which was *nothing*. :D

Remington Serial Number Page completely re-written. Thu, 18 Dec 2014
Source #18, the Sheridan Binder, gives us Remington factory production numbers with a granularity of 1-month increments. It took a loooong time, but I've finally typed it all in. Behold, the Mother Of All Serial Number Pages! (:

Hammond and Blickensderfer pages updated! Thu, 18 Dec 2014
Peter Weil submitted his lists of documented serial numbers for Hammonds and Blicks, and so I've added his research as Sources #39 and #40 and added his observed numbers to the relevant pages. Thanks Peter!

Demountable page updated Thu, 18 Dec 2014
I found some new info on Demountable in Source #18, so added that to the Demountable page.

Olivetti Graphika serial numbers added to Olivetti page Thu, 18 Dec 2014
Olivetti Graphika serial numbers added to Olivetti page, thanks to Rob Bowker alerting me to some information from collector Domenico Scarzello in Italy.

Olivetti Page updated yet again! Thu, 18 Dec 2014
Thanks to a sheet of info from collector Enrico Morozzi in Italy, we have more accurate and complete serial number ranges for the oldest Olivetti standards and a few other categories.

Bennett/Junior Pages Updated Thu, 18 Dec 2014
Thanks to an email alert from ProfessorC about a tidbit of info dropped in the Yahoo groups by Thomas Furtig, we now have some info about the different models. No luck with dates to serial numbers yet.