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Mountain of the Knowledge Master
Dr. Inventor's House
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Mountain of the Knowledge Master
Chapter 1 B.C.: Before Calculators
Chapter 2 The World's First Calculator Only Did Addition?!
Chapter 3 The First Electric-Powered Calculator
Chapter 4 Electric Calculators for All
Chapter 5 Emergence of the Desktop Calculator
Dr.Inventor's House
Play Park
Glossary
For Teacher and Parents
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