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Ready reckoner 'Prompt' calculator, 19th century.
'Supra Bareme' ready reckoner, c 1925.
The 'Tachylemme' ready reckoner, c 1876.
The 'Multiplicateur Enfantin' ready reckoner, c 1880.
Calculating scale, 1807.
Calculating scale, 1807.
Robertson's 'Rapid Calculator', c 1910.
Plastic pencil case with 'Turn 'N' Learn' ready reckoner, c 1994.
Bate's ready reckoner, 1824. Slide rule mad
Hines' 'Patent Weight and Quantity Calculator', c 1908.
The 'Tachypoly Plasiasme' ready reckoner, 1880-1884.
Francois Barreme, French mathematician, c 1690.
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