| 31. | The arithmometer was the first mechanical calculator strong enough and reliable enough to be used daily in an office environment.
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| 32. | :: : I remember a mechanical calculator from the 1960s that would run indefintiely if you divided by zero.
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| 33. | In the 1930s, the rest of the nascent computing industry was limited to mechanical calculators that used the decimal system.
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| 34. | By the early 1970s electronic pocket calculators ended manufacture of mechanical calculators, although the Curta remains a popular collectable item.
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| 35. | In the 1940s and 1950s, using mechanical calculators, women in an all-female computations group performed trajectory calculations.
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| 36. | For 40 years, the arithmometer was the only mechanical calculator available for sale and was sold all over the world.
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| 37. | It was at Trinity College here that Charles Babbage, inventor of the mechanical calculator, studied mathematics in the early 1800s.
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| 38. | Handheld mechanical calculators such as the 1948 Curta continued to be used until they were displaced by electronic calculators in the 1970s.
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| 39. | Under the popular leadership of Gunnar Ericsson, Facit focused increasingly on its mechanical calculators, branding, marketing and global expansion.
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| 40. | Any other mechanical calculator capable of fully automatic analog comparators to anticipate the overdraft, and prepare for the next quotient digit.
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