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Gallery RPN calculator prototypes A DIY1 and two DIY2 calculators. The DIY1 uses a modified off-the-shelf case with a laminated photo paper overlay. The DIY2 us
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RPN calculator prototypes

1. A DIY1 and ... 2. A DIY1 and ... 3. DIY3 in...

A DIY1 and two DIY2 calculators. The DIY1 uses a modified off-the-shelf case with a laminated photo paper overlay. The DIY2 us

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