CALCULATOR

contests between abacus and: g80 8/22 31; g80 10/22 30; g78 12/22 19

disadvantages: g76 9/8 25

discussion: g76 9/8 23-26

everyday uses: g76 9/8 24-25

Japan:

production: g76 4/8 30

replacing slide rule: g77 4/22 29-30; g76 9/22 30

use in school: g76 9/8 25-26