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Additional Pictures 

 

This HP-21 Scientific Calculator was manufactured in February 1975 by
Hewlett Packard in the United States (Date code 1508A wk 08 yr 1975).

The HP-21 is powered by 2 AA-sized rechargeable batteries.


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

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