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CALCULATOR

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I used several brands until about 1990, when I bought my first HP.
I do simple things on it (formulas), but 4 lines of numbers visible are very helpful.
 
Its power though is mainly in reverse notation.
You get the result with fewer clicks.
Once you start using it, you will never let go.
 
I would recommend top-of-the-line HP.
 
Sincerely, Gregory from OZ