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I am now a happy owner of the rare HP 22S. The Pioneer series of HP calculators are my favorite. I think what I don't have is the original 17B and 32S (one-shift 32S). My review: http://edspi31415.blogspot.com/2017/07/r...p-22s.html

[Image: HP%2B22S.jpg]

HP 10B, 10bII+ (updated), 14B, 17bII+ (updated), 20S, 21S, 22S, 32SII, 42S

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Eddie W. Shore