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Additional Pictures 

 

The sales box of a very early Radio Shack EC-100 calculator shows its manufacturing date.



This Radio Shack EC-100 (Version 1) was manufactured in September 1972 by Texas Instruments.

A Radio Shack EC-100 (Version 1) with the [+=] and [-=] keys inserted the wrong way.


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

Joerg Woerner, October 31, 2021. No reprints without written permission.