Rare hp 31 E calculator without Serial number/ Country mfg.
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Should i think this is a prototype? any info would be greatly appreciated thanks.



I'd say your best bet might be to ask here: http://www.hpmuseum.org/forum/forum-4.html

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ewh, scientific calculator
GERMS!!!
http://www.hpmuseum.org/hp31.htm Seems to be a direct link to the info page on this calculator?
But it provides no information for me as to why there is no serial number or country of mfg. Also this is an RPN calculator which is slightly different then your run of the mill scientific calculator, And by slightly different i mean much much different.
  
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