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Additional Pictures 

 

Letters found on an early SR-51 (Serial No. 0001589) and
a later SR-51 (Serial No. 0044521).


 
The main printed circuit board of an early SR-51 gives production codes 
of week 42 year 1974 on the firmware ! 


If you have additions to the above article please email: joerg@datamath.org.

© Joerg Woerner, July 14, 2002. No reprints without written permission.