Additional Pictures 


The calculator circuit was manufactured in the 50th week of the 
year 1973 by Western Digital and featured already a full memory.

The printed circuit board of a second EC-300 carries a magic number:
13-04-709-479. This is an identifier of Texas Instruments !

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If you have additions to the above article please email:

Joerg Woerner, September 20, 2002. No reprints without written permission.