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Additional Pictures 

 

This SR-56 was manufactured in December 1976 by
Texas Instruments in Brazil (Date code 5076 CIB wk 50 yr 1976).

The printed circuit board (PCB) of the SR-56 looks very familiar to us.


horizontal rule

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

Joerg Woerner, November 11, 2009. No reprints without written permission.