Title: Very useful reference
Review: Few people nowadays retained their comptometer skills. Just as languages die off from atrophy so also is the fait of the comptometer. You see tem on desks and in movies but can you use it if you had to? Look closely on the key and you will find two sets of numbers. The small set is for subtraction and division. A good comptometer operator only needs to use the first five rows to complete their calculations. This is also a practice book. You get a lot closer to the numbers you are crunching (it even makes a crunching sound) then with these abstract hand calculators. The calculator in the title is more of a "ten key." Any way this book looks good as part of the desk display.It all adds up;: The growth of Victor Comptometer Corporation
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