DATAMATH  CALCULATOR  MUSEUM

Additional Pictures 

 

This HP-31E Scientific Calculator was manufactured in December 1978 by
Hewlett Packard in Singapore (Date code 1850S » wk 50 yr 1978).
The HP-31E is powered by 2 AA-sized rechargeable batteries.


horizontal rule

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

© Joerg Woerner, December 3, 2023. No reprints without written permission.