Site.ObjectPageTitles History
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Logarithmic Tables
First Devices
The first “Computer Manual”
Sectors
Conversion Devices
Slide Rules
Cylindrical Slide Rules
Circular Slide Rules
Troncet Type Devices
Keyboard Adding Machines
Arithmometers
True Multiplying Calculators
Proportional Rod Calculators
Pinwheel Calculators
Comptometers
- Comptometer “Woodie” 1896?
- Comptometer oil bottle 1907
- Sumlock Demonstrator 1955
- Sumlock Comptometer 1950s
Curta Calculators
Motorised Calculating Machines
Electronic Calculators
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Ephemerae
05 December 2011
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