Office Machines Course, Adding and Calculating Machines: Full-keyboard Adding Listing Machine, Rotary Calculator, Ten-key Adding Listing Machine, Key-driven Calculator

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South-Western Publishing Company, 1953 - Calculators - 124 pages
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Contents

Use of the First and Second Fingers in Addition
1
Use of the Thumb in Addition
5
Adding ThreeDigit Numbers with Zeros
7
Copyright

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